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A population containing more alternative alleles has greater genetic diversity and greater potential variation."},{"text":"The number of different genes carried by each organism in a population.","correct":false,"explanation":"Members of a species generally possess the same genes, but may carry different alleles of those genes. Genetic diversity is the number of different alleles in the population."},{"text":"The number of different species living together in a population.","correct":false,"explanation":"Counting different species measures species diversity, not genetic diversity. Genetic diversity concerns the number of different alleles of genes within a population of one species."},{"text":"The number of different chromosomes found in each organism in a population.","correct":false,"explanation":"Chromosome number is usually characteristic of a species and does not measure variation within its population. Genetic diversity is measured by the number of different alleles present."}]},{"id":"0f899dd3-9ae0-4028-9354-d8558b448559","cardType":"basic","points":1,"front":"Why is genetic diversity required for natural selection to occur?","back":"It provides inherited variation for selection to act upon.","mcqOptions":[{"text":"It provides inherited variation for selection to act upon.","correct":true,"explanation":"Natural selection requires heritable differences between individuals. Selection changes allele frequencies because individuals with advantageous inherited characteristics tend to survive and reproduce more successfully."},{"text":"It provides environmental variation for selection to act upon.","correct":false,"explanation":"Environmental differences can alter phenotypes, but they do not drive evolution unless the variation is inherited. Natural selection requires inherited variation caused by differences in alleles."},{"text":"It provides acquired characteristics for selection to act upon.","correct":false,"explanation":"Characteristics acquired during an organism’s lifetime are generally not encoded in its alleles and cannot be passed to offspring. Selection acts on inherited variation."},{"text":"It provides identical characteristics for selection to act upon.","correct":false,"explanation":"If individuals had identical inherited characteristics, no phenotype would have a selective advantage. Genetic diversity provides inherited variation that allows differential survival and reproduction."}]},{"id":"3f7d432e-2ceb-4b93-a662-44f2bf1d9c4f","cardType":"cloze","points":null,"front":"Mutations are [ ] changes in the DNA base sequence that can create new alleles.","back":"Mutations are random changes in the DNA base sequence that can create new alleles.","mcqOptions":[{"text":"random","correct":true,"explanation":"Mutations occur without regard to whether their effects will benefit an organism. Natural selection subsequently determines whether a newly created allele increases in frequency."},{"text":"directed","correct":false,"explanation":"A need or environmental challenge does not direct a specific useful DNA change. Mutations are random, although the environment selects among the resulting phenotypes."},{"text":"predictable","correct":false,"explanation":"The precise location and effect of an individual mutation cannot normally be predicted from an organism’s needs. Mutations are random changes in the DNA base sequence."},{"text":"purposeful","correct":false,"explanation":"Mutations do not arise because organisms purposefully produce beneficial traits. They occur randomly, and advantageous alleles may then become more common through natural selection."}]},{"id":"1e2dce74-9923-4b31-9206-e85bfd8fe885","cardType":"cloze","points":null,"front":"Mutations are random changes in the [ ] that can create new alleles.","back":"Mutations are random changes in the DNA base sequence that can create new alleles.","mcqOptions":[{"text":"DNA base sequence","correct":true,"explanation":"A mutation is a change in the order of nucleotide bases in DNA. This can create a new allele and may alter the protein encoded by a gene."},{"text":"amino acid sequence","correct":false,"explanation":"An altered amino acid sequence may be a consequence of a mutation, but it is not the mutation itself. A mutation changes the DNA base sequence."},{"text":"RNA base sequence","correct":false,"explanation":"RNA may carry a transcript of altered genetic information, but inherited mutations are defined as changes in the DNA base sequence, not the RNA sequence."},{"text":"chromosome number","correct":false,"explanation":"Changes in chromosome number are chromosome mutations, but this statement specifically defines mutations that create new alleles through changes in the DNA base sequence."}]},{"id":"a188c8bf-87e3-4ddd-9f47-6691ab4a1da8","cardType":"basic","points":3,"front":"Outline the process of natural selection leading to evolution.","back":"

Random mutation produces an advantageous allele
Possessors have higher survival and reproductive success
Allele is inherited and increases in frequency over generations

","mcqOptions":[{"text":"

Random mutation produces an advantageous allele
Possessors have higher survival and reproductive success
Allele is inherited and increases in frequency over generations

","correct":true,"explanation":"Random mutation generates an advantageous allele, whose possessors leave more offspring. Because the allele is inherited, differential reproductive success increases its frequency over successive generations."},{"text":"

Environmental change produces a required advantageous allele
Possessors have equal survival and reproductive success
Allele is inherited and remains at the same frequency over generations

","correct":false,"explanation":"The environment does not produce alleles according to need, and equal reproductive success would not change allele frequency. Random mutation creates variation before selection increases advantageous alleles."},{"text":"

Random mutation produces an advantageous allele
Possessors have lower survival and reproductive success
Allele is inherited and increases in frequency over generations

","correct":false,"explanation":"An allele cannot normally increase through selection if its possessors leave fewer offspring. Advantageous alleles spread because they confer higher survival and reproductive success."},{"text":"

Random mutation produces an advantageous allele
Possessors have higher survival and reproductive success
Allele is not inherited and increases in frequency over generations

","correct":false,"explanation":"Greater reproductive success changes allele frequency only when the advantageous allele is heritable. Natural selection requires inheritance so that offspring receive the allele and pass it onwards."}]},{"id":"7ca77603-989f-47a1-99d2-e7bb55b1d317","cardType":"basic","points":1,"front":"How is evolution defined in terms of genetics?","back":"A change in allele frequencies in a population over many generations.","mcqOptions":[{"text":"A change in allele frequencies in a population over many generations.","correct":true,"explanation":"Evolution occurs when the relative frequencies of alleles in a population change across generations, often because selection, genetic drift, mutation or gene flow affects inheritance."},{"text":"A change in phenotype frequencies in an individual over many generations.","correct":false,"explanation":"An individual does not exist over many generations, and phenotype changes alone may be environmental. Evolution is a change in allele frequencies within a population over generations."},{"text":"A change in chromosome numbers in a population over many generations.","correct":false,"explanation":"Chromosome number can change in some evolutionary events, but it is not the general genetic definition. Evolution is any change in population allele frequencies over generations."},{"text":"A change in environmental conditions in a population over many generations.","correct":false,"explanation":"Environmental change may create a selection pressure, but it is not itself evolution. Evolution requires a resulting change in the population’s allele frequencies over generations."}]},{"id":"21da4ff5-4b33-4b1c-b12f-67f46e1b54db","cardType":"cloze","points":null,"front":"In [ ] selection, individuals with one extreme phenotype are more likely to survive and reproduce.","back":"In directional selection, individuals with one extreme phenotype are more likely to survive and reproduce.","mcqOptions":[{"text":"directional","correct":true,"explanation":"Directional selection favours individuals at one end of the phenotypic range. Their greater reproductive success shifts the population mean towards that extreme over generations."},{"text":"stabilising","correct":false,"explanation":"Stabilising selection favours intermediate phenotypes and selects against both extremes. Directional selection instead favours one extreme phenotype and shifts the population mean."},{"text":"disruptive","correct":false,"explanation":"Disruptive selection favours both extreme phenotypes while selecting against intermediates. Directional selection favours only one extreme of the phenotypic range."},{"text":"balancing","correct":false,"explanation":"Balancing selection maintains multiple alleles or phenotypes in a population rather than consistently favouring one extreme. The selection pattern described is directional selection."}]},{"id":"ab8d6321-b70f-4e2f-8a4c-e97c51cf5a0f","cardType":"basic","points":2,"front":"How does antibiotic resistance in bacteria illustrate directional selection?","back":"The mean phenotype shifts towards the extreme of resistance because non-resistant bacteria are killed by the selection pressure.","mcqOptions":[{"text":"The mean phenotype shifts towards the extreme of resistance because non-resistant bacteria are killed by the selection pressure.","correct":true,"explanation":"Antibiotics kill susceptible bacteria, while resistant bacteria survive and reproduce. Resistance alleles therefore increase in frequency, shifting the population’s mean phenotype towards resistance."},{"text":"The mean phenotype shifts towards the extreme of susceptibility because resistant bacteria are killed by the selection pressure.","correct":false,"explanation":"This reverses the direction of selection. Antibiotics preferentially kill susceptible bacteria, allowing resistant bacteria to reproduce and shifting the mean phenotype towards resistance."},{"text":"The mean phenotype remains at the level of susceptibility because all bacteria are affected equally by the selection pressure.","correct":false,"explanation":"Bacteria vary genetically in resistance, so antibiotics do not affect all individuals equally. Resistant bacteria survive disproportionately, causing the mean phenotype to shift towards resistance."},{"text":"The mean phenotype shifts towards an intermediate level of resistance because both extreme phenotypes are killed by the selection pressure.","correct":false,"explanation":"This describes stabilising selection, but antibiotics impose directional selection by preferentially killing susceptible bacteria. The mean therefore shifts towards the resistant extreme, not an intermediate phenotype."}]},{"id":"ef522b2e-9ca3-4623-9650-b9a869204768","cardType":"cloze","points":null,"front":"In [ ] selection, individuals with intermediate phenotypes are favoured and extremes are selected against.","back":"In stabilising selection, individuals with intermediate phenotypes are favoured and extremes are selected against.","mcqOptions":[{"text":"stabilising","correct":true,"explanation":"Stabilising selection favours individuals near the population mean and selects against both extremes, reducing phenotypic variation while generally maintaining the mean phenotype."},{"text":"directional","correct":false,"explanation":"Directional selection favours one extreme phenotype rather than intermediate phenotypes. The correct term is stabilising selection because both extremes are selected against."},{"text":"disruptive","correct":false,"explanation":"Disruptive selection favours both extreme phenotypes and selects against intermediates. The correct term is stabilising selection, which favours phenotypes near the mean."},{"text":"sexual","correct":false,"explanation":"Sexual selection favours characteristics that increase mating success and does not necessarily favour intermediate phenotypes. The described pattern is stabilising selection."}]},{"id":"328f47eb-021f-4da4-bee3-b504d9be4384","cardType":"basic","points":2,"front":"How does human birth weight show stabilising selection?","back":"

Very high or low weights have lower survival
The mean birth weight is maintained as variation decreases

","mcqOptions":[{"text":"

Very high or low weights have lower survival
The mean birth weight is maintained as variation decreases

","correct":true,"explanation":"Babies with birth weights near the mean have the greatest survival prospects. Selection against both very low and very high weights reduces variation around a maintained mean."},{"text":"

Very high or low weights have higher survival
The mean birth weight shifts upwards as variation increases

","correct":false,"explanation":"This reverses the survival pattern: babies at either extreme have greater risks than those near the mean. Stabilising selection maintains the mean while reducing variation."},{"text":"

Intermediate weights have lower survival
The mean birth weight is lost as variation increases

","correct":false,"explanation":"Intermediate birth weights generally have higher, not lower, survival. Stabilising selection removes extreme phenotypes, maintaining the mean birth weight while reducing variation."},{"text":"

Very high or low weights have equal survival
The mean birth weight shifts downwards as variation decreases

","correct":false,"explanation":"The extremes do not have equal survival to intermediate weights; they face stronger selection. Consequently, variation decreases and the mean birth weight is maintained."}]},{"id":"e0877fb2-fcbd-4931-a6b1-c5b79b5f3e43","cardType":"basic","points":2,"front":"What is the difference between an organism's genotype and its phenotype?","back":"Genotype is the alleles possessed; phenotype is the observable characteristics produced by genotype and environment.","mcqOptions":[{"text":"Genotype is the alleles possessed; phenotype is the observable characteristics produced by genotype and environment.","correct":true,"explanation":"An organism’s genotype is its genetic constitution, represented by the alleles it possesses. Its phenotype comprises observable features resulting from interactions between genotype and environment."},{"text":"Genotype is the observable characteristics; phenotype is the alleles inherited from both parents.","correct":false,"explanation":"This reverses the definitions. Genotype refers to the alleles an organism possesses, whereas phenotype refers to observable characteristics produced through genotype-environment interaction."},{"text":"Genotype is the environmental conditions; phenotype is the alleles produced by the environment.","correct":false,"explanation":"Environmental conditions can influence phenotype but do not define genotype. Genotype is the alleles possessed, while phenotype results from both genotype and environmental effects."},{"text":"Genotype is the expressed alleles; phenotype is the alleles inherited without environmental influence.","correct":false,"explanation":"Genotype is not restricted to expressed alleles, and phenotype is not inherited alleles alone. Phenotype is observable characteristics produced by genotype and environment."}]},{"id":"2f505912-e3d9-4886-813b-061fa73bf8ae","cardType":"basic","points":3,"front":"List the three categories of adaptations.","back":"

Anatomical
Physiological
Behavioural

","mcqOptions":[{"text":"

Anatomical
Physiological
Behavioural

","correct":true,"explanation":"Adaptations are classified as anatomical features of structure, physiological processes occurring within organisms, or behavioural actions performed in response to conditions."},{"text":"

Anatomical
Reproductive
Behavioural

","correct":false,"explanation":"Reproductive is not one of the three standard adaptation categories at A Level. The required categories are anatomical, physiological and behavioural."},{"text":"

Ecological
Physiological
Inherited

","correct":false,"explanation":"Ecological and inherited do not replace the standard categories of adaptation. Adaptations are classified as anatomical, physiological or behavioural."},{"text":"

Developmental
Environmental
Reproductive

","correct":false,"explanation":"Developmental, environmental and reproductive are not the three standard categories. The recognised categories are anatomical, physiological and behavioural adaptations."}]},{"id":"c5dab775-5ec3-49a0-a931-a38d4fd728ba","cardType":"basic","points":1,"front":"Classify 'thick waxy cuticles on leaves' as an adaptation type.","back":"Anatomical adaptation.","mcqOptions":[{"text":"Anatomical adaptation.","correct":true,"explanation":"A thick waxy cuticle is a physical feature of leaf structure that reduces water loss, so it is classified as an anatomical adaptation."},{"text":"Physiological adaptation.","correct":false,"explanation":"Physiological adaptations involve internal processes or functions. A thick waxy cuticle is a structural feature of the leaf, making it an anatomical adaptation."},{"text":"Behavioural adaptation.","correct":false,"explanation":"Behavioural adaptations involve actions performed by an organism. A thick waxy cuticle is part of the leaf’s physical structure, so it is anatomical."},{"text":"Genetic adaptation.","correct":false,"explanation":"Genetic variation underlies inherited adaptations, but genetic is not the relevant adaptation category here. The visible structural feature is classified as anatomical."}]},{"id":"b090bcf5-3776-4e75-9da1-269984138943","cardType":"basic","points":1,"front":"Classify 'producing concentrated urine' as an adaptation type.","back":"Physiological adaptation.","mcqOptions":[{"text":"Physiological adaptation.","correct":true,"explanation":"Producing concentrated urine involves regulating water and solute processing inside the body, so it is a functional process classified as a physiological adaptation."},{"text":"Anatomical adaptation.","correct":false,"explanation":"Anatomical adaptations are structural features, whereas urine concentration is a functional process carried out by the kidneys. It is therefore a physiological adaptation."},{"text":"Behavioural adaptation.","correct":false,"explanation":"Behavioural adaptations are actions such as migration or seeking shade. Producing concentrated urine is an internal bodily process, making it physiological."},{"text":"Environmental adaptation.","correct":false,"explanation":"Environmental is not the appropriate category for an organism’s internal water-conservation process. Producing concentrated urine is classified as a physiological adaptation."}]},{"id":"8e891cd4-f994-4a7f-a96b-f2adc923dce4","cardType":"basic","points":1,"front":"Classify 'migrating to avoid heat' as an adaptation type.","back":"Behavioural adaptation.","mcqOptions":[{"text":"Behavioural adaptation.","correct":true,"explanation":"Migration is an action performed by organisms in response to environmental conditions. Moving to avoid heat is therefore classified as a behavioural adaptation."},{"text":"Anatomical adaptation.","correct":false,"explanation":"Anatomical adaptations are physical structural features, not actions. Migrating is something an organism does, so avoiding heat through migration is behavioural."},{"text":"Physiological adaptation.","correct":false,"explanation":"Physiological adaptations are internal functional processes, such as producing concentrated urine. Migration is an organism’s action and is therefore a behavioural adaptation."},{"text":"Seasonal adaptation.","correct":false,"explanation":"Seasonal timing may trigger migration, but seasonal is not an adaptation category. Migration itself is an action and is classified as behavioural."}]},{"id":"12f3effe-f46d-4adb-9df1-c55cad3d91bb","cardType":"cloze","points":null,"front":"Bacterial population sizes are often plotted using a [ ] scale because values differ by powers of 10.","back":"Bacterial population sizes are often plotted using a logarithmic scale because values differ by powers of 10.","mcqOptions":[{"text":"logarithmic","correct":true,"explanation":"A logarithmic scale represents successive powers of 10 at equal intervals, allowing very large ranges of bacterial population size to be displayed clearly."},{"text":"linear","correct":false,"explanation":"A linear scale uses equal intervals for equal numerical increases, so powers of 10 become difficult to compare across a large range. A logarithmic scale is appropriate."},{"text":"exponential","correct":false,"explanation":"Bacterial populations may grow exponentially, but exponential describes a growth pattern rather than the appropriate axis scale. Values spanning powers of 10 use a logarithmic scale."},{"text":"arithmetic","correct":false,"explanation":"An arithmetic scale is effectively linear, with equal spacing for equal numerical differences. Population values differing by powers of 10 require a logarithmic scale."}]},{"id":"0eb76ecf-ebce-45d5-8296-4c0f18f0cf6c","cardType":"cloze","points":null,"front":"Bacterial population sizes are often plotted using a logarithmic scale because values differ by [ ].","back":"Bacterial population sizes are often plotted using a logarithmic scale because values differ by powers of 10.","mcqOptions":[{"text":"powers of 10","correct":true,"explanation":"A logarithmic scale represents successive powers of 10, allowing bacterial populations spanning several orders of magnitude to be displayed clearly on one graph."},{"text":"factors of 2","correct":false,"explanation":"Confusing logarithmic scales with repeated doubling overlooks their base-10 structure. The values differ by powers of 10, which accommodates very large population ranges."},{"text":"equal percentages","correct":false,"explanation":"Percentage differences do not specifically require a logarithmic scale. Bacterial population values can span powers of 10, so a log scale makes them easier to compare."},{"text":"single units","correct":false,"explanation":"Values differing by single units could be displayed on a linear scale. A logarithmic scale is useful because bacterial populations often differ by powers of 10."}]},{"id":"0d5e7fae-d8d2-4c39-9e1d-840900e635c2","cardType":"basic","points":2,"front":"In Required Practical 6, why is aseptic technique used?","back":"

Prevents contamination by unwanted microorganisms
Ensures valid results by keeping the culture pure

","mcqOptions":[{"text":"

Prevents contamination by unwanted microorganisms
Ensures valid results by keeping the culture pure

","correct":true,"explanation":"Aseptic technique excludes unwanted microorganisms, so only the intended bacterium is cultured. This prevents contamination from affecting zones of inhibition and therefore supports valid results."},{"text":"

Prevents dehydration by unwanted evaporation
Ensures larger results by keeping the agar moist

","correct":false,"explanation":"Preventing agar dehydration is not the main purpose of aseptic technique. It prevents contamination by unwanted microorganisms, keeping the culture pure so the results are valid."},{"text":"

Prevents diffusion by antimicrobial substances
Ensures smaller results by restricting their movement

","correct":false,"explanation":"Antimicrobial substances must diffuse through the agar to produce measurable inhibition zones. Aseptic technique instead prevents contamination and keeps the bacterial culture pure for valid results."},{"text":"

Prevents mutation by cultured microorganisms
Ensures identical results by keeping their DNA stable

","correct":false,"explanation":"Aseptic technique does not prevent mutations or stabilise bacterial DNA. It excludes unwanted microorganisms, ensuring that observed effects involve only the intended pure culture."}]},{"id":"9121a85e-3e75-45e8-b0d4-01433c8f0ff1","cardType":"basic","points":2,"front":"In Required Practical 6, what is the purpose of the control disc?","back":"To show that the zone of inhibition is caused by the antimicrobial substance and not the paper disc or solvent.","mcqOptions":[{"text":"To show that the zone of inhibition is caused by the antimicrobial substance and not the paper disc or solvent.","correct":true,"explanation":"The control disc lacks the antimicrobial substance, so any difference between it and the test disc demonstrates that antimicrobial activity caused the zone of inhibition."},{"text":"To show that the zone of inhibition is caused by the paper disc and not the antimicrobial substance or solvent.","correct":false,"explanation":"The control tests whether the paper disc or solvent affects bacterial growth; it should not produce inhibition. A test-disc zone can therefore be attributed to the antimicrobial substance."},{"text":"To show that the bacterial growth is caused by the antimicrobial substance and not the paper disc or solvent.","correct":false,"explanation":"An antimicrobial substance inhibits or kills bacteria rather than causing their growth. The control establishes that the antimicrobial substance, not the disc or solvent, causes the inhibition zone."},{"text":"To show that the zone of inhibition is caused by the incubation temperature and not the paper disc or solvent.","correct":false,"explanation":"Incubation temperature is a controlled variable applied to the entire plate, not the factor tested by the control disc. The control isolates the effect of the antimicrobial substance."}]},{"id":"1a7e290d-18ff-477f-9996-f86b39280c77","cardType":"basic","points":1,"front":"Why are Petri dishes in Required Practical 6 not fully sealed with tape?","back":"To prevent the growth of harmful anaerobic bacteria.","mcqOptions":[{"text":"To prevent the growth of harmful anaerobic bacteria.","correct":true,"explanation":"Leaving a small air gap allows oxygen into the dish. This avoids anaerobic conditions that could favour the growth of harmful anaerobic bacteria."},{"text":"To prevent the growth of harmless aerobic bacteria.","correct":false,"explanation":"Incomplete sealing does not prevent aerobic bacterial growth because oxygen remains available. It prevents anaerobic conditions developing and reduces the risk of culturing harmful anaerobic bacteria."},{"text":"To prevent the evaporation of sterile nutrient agar.","correct":false,"explanation":"Fully sealing a dish would reduce evaporation rather than prevent it. Dishes are not fully sealed so oxygen remains available, preventing harmful anaerobic bacteria from growing."},{"text":"To prevent the diffusion of active antimicrobial substances.","correct":false,"explanation":"Tape around the dish does not control diffusion through the agar. Partial sealing maintains oxygen availability, reducing the likelihood that harmful anaerobic bacteria will grow."}]},{"id":"bd6ecd18-b7cc-4157-87f0-e58fbd997d68","cardType":"cloze","points":null,"front":"The clear area where bacteria have not grown on an agar plate is called the [ ].","back":"The clear area where bacteria have not grown on an agar plate is called the zone of inhibition.","mcqOptions":[{"text":"zone of inhibition","correct":true,"explanation":"The zone of inhibition is the clear region around an antimicrobial source where susceptible bacteria have been killed or their growth has been prevented."},{"text":"zone of inoculation","correct":false,"explanation":"Inoculation is the introduction of microorganisms to the agar, not the clear region produced by an antimicrobial. That bacteria-free area is the zone of inhibition."},{"text":"bacterial lawn","correct":false,"explanation":"A bacterial lawn is the continuous visible growth covering the agar surface. The clear area where growth is prevented is called the zone of inhibition."},{"text":"colony of bacteria","correct":false,"explanation":"A bacterial colony is a visible mass of cells produced through growth. The clear area containing no bacterial growth is the zone of inhibition."}]},{"id":"28bcff86-1a6c-4aeb-bb5f-b67ff43abada","cardType":"basic","points":1,"front":"How is the area of a circular zone of inhibition calculated?","back":"$$A = \\pi r^{2}$","mcqOptions":[{"text":"$$A = \\pi r^{2}$","correct":true,"explanation":"A zone of inhibition is treated as a circle, so its area equals pi multiplied by the square of its radius."},{"text":"$$A = 2\\pi r$","correct":false,"explanation":"This calculates the circumference rather than the area of the circular zone. Area requires the radius to be squared, giving $A = \\pi r^{2}$."},{"text":"$$A = \\pi d^{2}$","correct":false,"explanation":"Using the diameter directly as the radius makes the calculated area four times too large. The correct formula uses the squared radius: $A = \\pi r^{2}$."},{"text":"$$A = \\pi r$","correct":false,"explanation":"Failing to square the radius gives incorrect dimensions and does not calculate an area. The circular zone must be calculated using $A = \\pi r^{2}$."}]},{"id":"af79f945-5ca2-4923-8061-27811c4bfdec","cardType":"basic","points":1,"front":"What does a larger zone of inhibition indicate about an antimicrobial substance?","back":"The substance is more effective at killing or inhibiting the growth of the bacteria.","mcqOptions":[{"text":"The substance is more effective at killing or inhibiting the growth of the bacteria.","correct":true,"explanation":"A larger clear area means bacterial growth has been prevented farther from the disc, indicating that the antimicrobial substance has a greater inhibitory or killing effect."},{"text":"The substance is less effective at killing or inhibiting the growth of the bacteria.","correct":false,"explanation":"This reverses the relationship between zone size and effectiveness. A larger zone shows that bacterial growth is inhibited over a greater area, so the substance is more effective."},{"text":"The substance is more effective at increasing or accelerating the growth of the bacteria.","correct":false,"explanation":"The clear zone represents absent growth, not accelerated growth. A larger zone therefore indicates greater effectiveness at killing bacteria or inhibiting their growth."},{"text":"The substance is less concentrated and therefore unable to affect the growth of the bacteria.","correct":false,"explanation":"A substance unable to affect bacterial growth would produce little or no inhibition zone. A larger zone indicates stronger antimicrobial effectiveness under the conditions tested."}]}]}],"examCountdown":{"examDate":"2027-05-13","paperLabel":"Paper 1"},"heading":"Genetic diversity and adaptation","title":"Genetic diversity and adaptation Flashcards","topbar":{"backHref":"/as-level/biology/aqa/flashcards"},"topicSidebar":"$L37"}]}],"topicId":"f1574b32-6870-5894-8903-3bc61c60f412","walled":"$L38"}],"$L39","$L3a"]