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quantity of a live pathogen, or its toxins.","correct":false,"explanation":"A live pathogen could cause disease, so vaccines use dead or inactive pathogens, or their antigens, in a small quantity."},{"text":"A small quantity of antibiotics, or painkillers.","correct":false,"explanation":"Antibiotics treat bacterial infections and painkillers relieve symptoms; neither trains lymphocytes to recognise a pathogen's antigens."},{"text":"A large quantity of antibodies, or red blood cells.","correct":false,"explanation":"Vaccines stimulate the person's lymphocytes to make antibodies rather than supplying antibodies or blood cells directly."}]},{"id":"4b269b9c-e00d-4f28-bd3a-cb148fc0dac4","cardType":"basic","points":1,"front":"Why can a vaccine not give you the disease?","back":"It is harmless, so it cannot cause the disease.","mcqOptions":[{"text":"It is harmless, so it cannot cause the disease.","correct":true,"explanation":"The pathogen in a vaccine is dead or inactive, or only its antigens are used, so it cannot reproduce and cause the disease."},{"text":"It is too small, so it cannot enter body cells.","correct":false,"explanation":"The size of a pathogen does not determine whether it causes disease. Vaccines are harmless because the pathogen is dead, inactive, or represented only by antigens."},{"text":"It is destroyed by antibodies before entering the body.","correct":false,"explanation":"The vaccine must enter the body and stimulate an immune response; it is harmless because it cannot cause the disease, not because antibodies remove it first."},{"text":"It contains only antibiotics, so bacteria cannot survive.","correct":false,"explanation":"Vaccines do not contain only antibiotics, and antibiotics would not prevent viral disease. The vaccine itself is harmless because the pathogen is inactive or absent."}]},{"id":"5f7b8ed2-7552-4f5c-be8a-b1e33bd76f9a","cardType":"basic","points":1,"front":"Why can antibodies made after vaccination recognise the live pathogen?","back":"The vaccine's antigens have the same shape as those on the live pathogen.","mcqOptions":[{"text":"The vaccine's antigens have the same shape as those on the live pathogen.","correct":true,"explanation":"Antibodies bind to antigens with a complementary shape. Matching antigen shapes therefore allow antibodies produced after vaccination to recognise the live pathogen."},{"text":"The vaccine's antigens have a different shape from those on the live pathogen.","correct":false,"explanation":"Different antigen shapes would not match the antibodies made after vaccination. The vaccine works because its antigens have the same shape as the live pathogen's antigens."},{"text":"The vaccine contains the same antibodies as those on the live pathogen.","correct":false,"explanation":"Pathogens do not carry the antibodies needed for this recognition. The vaccine provides matching antigens, which stimulate lymphocytes to produce complementary antibodies."},{"text":"The vaccine's antigens are larger than those on the live pathogen.","correct":false,"explanation":"Antigen size is not the key recognition feature. Antibodies recognise specific antigen shapes, which must match between the vaccine and the live pathogen."}]},{"id":"23f9c65d-a53b-4b53-b5a8-00b83637650f","cardType":"basic","points":1,"front":"What do lymphocytes recognise in a vaccine?","back":"They recognise the antigens as foreign.","mcqOptions":[{"text":"They recognise the antigens as foreign.","correct":true,"explanation":"Lymphocytes identify vaccine antigens as foreign substances rather than normal body molecules, initiating antibody production and the formation of immune memory."},{"text":"They recognise the antigens as self.","correct":false,"explanation":"Recognising antigens as self would normally prevent an immune attack. Vaccine antigens are effective because lymphocytes identify them as foreign."},{"text":"They recognise the antigens as nutrients.","correct":false,"explanation":"Nutrients are absorbed and used by the body, whereas vaccine antigens trigger immune defence because lymphocytes identify them as foreign."},{"text":"They recognise the antigens as antibodies.","correct":false,"explanation":"Antigens are molecules recognised by lymphocytes; antibodies are produced in response to them. The immune system identifies vaccine antigens as foreign."}]},{"id":"fb3134ae-5295-42a4-a7dd-3f5c0a18d34f","cardType":"basic","points":2,"front":"How do lymphocytes respond to vaccine antigens?","back":"They produce antibodies with a shape complementary to the antigens.","mcqOptions":[{"text":"They produce antibodies with a shape complementary to the antigens.","correct":true,"explanation":"Lymphocytes make antibodies whose binding sites are complementary to the vaccine antigens, allowing those antibodies to attach specifically to the pathogen."},{"text":"They produce antigens with a shape complementary to the antibodies.","correct":false,"explanation":"Antigens are found on pathogens and stimulate the response. Lymphocytes produce antibodies with a complementary shape, rather than producing antigens."},{"text":"They produce antibiotics with a shape complementary to the antigens.","correct":false,"explanation":"Antibiotics are medicines that target bacteria and are not made by lymphocytes. Lymphocytes produce specific antibodies against the vaccine antigens."},{"text":"They produce red blood cells with a shape complementary to the antigens.","correct":false,"explanation":"Red blood cells transport oxygen and do not bind specifically to antigens. Lymphocytes produce complementary antibodies as part of the immune response."}]},{"id":"2b06742c-6c36-4367-822d-348dbfd37f0c","cardType":"basic","points":2,"front":"Why is the first immune response to a vaccine slow?","back":"The matching lymphocytes must be found and multiply.","mcqOptions":[{"text":"The matching lymphocytes must be found and multiply.","correct":true,"explanation":"Only a small number of lymphocytes match a particular antigen initially. They must be located and clone themselves before producing enough antibodies."},{"text":"The matching lymphocytes must be destroyed and replaced.","correct":false,"explanation":"The matching lymphocytes are needed for defence and are multiplied, not destroyed. Finding and cloning them causes the delay in the first response."},{"text":"The pathogen must be absorbed and digested.","correct":false,"explanation":"Although immune cells can destroy pathogens, the first response is slow mainly because matching lymphocytes must first be found and multiplied."},{"text":"The antibodies must be stored and released.","correct":false,"explanation":"Large quantities of the correct antibodies are not already stored after first exposure. Matching lymphocytes must multiply before producing them."}]},{"id":"aec1c542-1d54-483f-a2b1-b1e2228b761d","cardType":"basic","points":1,"front":"What happens to some lymphocytes after vaccination?","back":"Some lymphocytes remain as memory cells.","mcqOptions":[{"text":"Some lymphocytes remain as memory cells.","correct":true,"explanation":"After vaccination, some activated lymphocytes remain as memory cells. They provide a faster, stronger response if the same pathogen enters later."},{"text":"Some lymphocytes remain as red blood cells.","correct":false,"explanation":"Red blood cells are a different blood-cell type and are not transformed lymphocytes. Some lymphocytes remain as memory cells after vaccination."},{"text":"Some lymphocytes remain as pathogen cells.","correct":false,"explanation":"Lymphocytes do not become pathogens. A subset remains as memory cells, ready to recognise the pathogen during a later exposure."},{"text":"Some lymphocytes remain as antibiotic cells.","correct":false,"explanation":"Antibiotics are chemical medicines, not cells produced by lymphocytes. The lasting immune protection comes from lymphocytes that remain as memory cells."}]},{"id":"d17a1b80-50bf-436f-91a8-55ff31451afd","cardType":"basic","points":1,"front":"How do memory cells respond when the same pathogen later enters the body?","back":"Memory cells recognise the pathogen's antigens straight away.","mcqOptions":[{"text":"Memory cells recognise the pathogen's antigens straight away.","correct":true,"explanation":"Memory cells remain after the first response and recognise the same antigens immediately during later exposure, allowing antibody production to begin rapidly."},{"text":"Memory cells recognise the pathogen's antigens after several weeks.","correct":false,"explanation":"A long delay would remove the advantage of immune memory. Memory cells recognise the same antigens straight away and produce a quicker response."},{"text":"Memory cells recognise the pathogen's antigens only after mutation.","correct":false,"explanation":"Mutation may alter antigens and reduce recognition. For the same pathogen, memory cells recognise its existing antigens straight away."},{"text":"Memory cells recognise the pathogen's antigens after antibiotics act.","correct":false,"explanation":"Antibiotics are not required for memory-cell recognition and do not treat viruses. Memory cells recognise matching antigens straight away."}]},{"id":"44f28c48-c011-439c-b10c-a16c81dd28c7","cardType":"basic","points":2,"front":"Why is the immune response to a second exposure faster and stronger?","back":"They produce the correct antibodies quickly and in large numbers.","mcqOptions":[{"text":"They produce the correct antibodies quickly and in large numbers.","correct":true,"explanation":"Memory cells are already present after the first exposure, so they rapidly produce many lymphocytes and the correct antibodies during the second exposure."},{"text":"They produce the correct antibodies slowly and in small numbers.","correct":false,"explanation":"This describes a weak primary response. Memory cells make the secondary response faster and stronger by producing the correct antibodies quickly and in large numbers."},{"text":"They produce the correct antibodies only after symptoms develop.","correct":false,"explanation":"A strong secondary response can prevent symptoms by acting before the pathogen causes illness. Antibodies are produced quickly and in large numbers."},{"text":"They produce different antibodies slowly and in large numbers.","correct":false,"explanation":"Different antibodies would not bind effectively to the pathogen's antigens. Memory cells produce the correct antibodies quickly and in large numbers."}]},{"id":"9907cb65-da69-4f95-a74a-47f064538813","cardType":"basic","points":2,"front":"How can vaccination prevent illness after later exposure to a pathogen?","back":"The antibodies destroy the pathogen before it makes the person ill.","mcqOptions":[{"text":"The antibodies destroy the pathogen before it makes the person ill.","correct":true,"explanation":"Vaccination prepares a rapid antibody response, allowing antibodies to destroy the pathogen before it multiplies enough to cause symptoms."},{"text":"The antibodies destroy the pathogen after it makes the person ill.","correct":false,"explanation":"Antibodies can help clear an infection after illness, but vaccination prevents illness when the rapid response destroys the pathogen beforehand."},{"text":"The antibodies change the pathogen into a harmless vaccine.","correct":false,"explanation":"Antibodies bind to and help destroy pathogens; they do not convert them into vaccines. Effective vaccination removes the pathogen before illness develops."},{"text":"The antibodies destroy the pathogen before it enters the body.","correct":false,"explanation":"Antibodies act inside the body after exposure. Vaccination prevents illness because the pathogen is destroyed before it has multiplied enough to cause disease."}]},{"id":"46ce4568-9659-4a02-a6ae-16c680093f72","cardType":"basic","points":2,"front":"Why does vaccination reduce the spread of a disease?","back":"A vaccinated person is immune, so the pathogen cannot reproduce and spread from them.","mcqOptions":[{"text":"A vaccinated person is immune, so the pathogen cannot reproduce and spread from them.","correct":true,"explanation":"Immunity prevents the pathogen from reproducing effectively in a vaccinated person, reducing the chance that they pass it on to others."},{"text":"A vaccinated person is immune, so the pathogen cannot enter the body from them.","correct":false,"explanation":"Vaccination does not necessarily stop every pathogen from entering the body. It reduces spread mainly by preventing successful reproduction and transmission."},{"text":"A vaccinated person is immune, so the pathogen cannot become visible from them.","correct":false,"explanation":"Visibility is unrelated to transmission. Vaccination reduces spread because the pathogen cannot reproduce effectively and therefore cannot be passed on easily."},{"text":"A vaccinated person is immune, so the pathogen cannot be killed by antibiotics from them.","correct":false,"explanation":"Antibiotics are not the mechanism of vaccine immunity and do not treat viruses. Reduced spread results from the pathogen being unable to reproduce and spread."}]},{"id":"3677f8d7-f76e-4bd2-84ce-72dbfeb9257f","cardType":"basic","points":2,"front":"Why does vaccinating a large proportion of the population limit disease spread?","back":"The pathogen has few people to infect, so it cannot spread easily.","mcqOptions":[{"text":"The pathogen has few people to infect, so it cannot spread easily.","correct":true,"explanation":"When most people are immune, an infectious pathogen encounters fewer susceptible hosts. This interrupts chains of transmission and limits its spread through the population."},{"text":"The pathogen has many people to infect, so it cannot spread easily.","correct":false,"explanation":"Many susceptible people would provide more opportunities for transmission, not fewer. Widespread vaccination limits spread by leaving few people to infect."},{"text":"The pathogen has few antibodies to infect, so it cannot spread easily.","correct":false,"explanation":"Pathogens infect people or cells, not antibodies. Vaccination limits spread because few susceptible people remain available for the pathogen to infect."},{"text":"The pathogen has few vaccines to infect, so it cannot spread easily.","correct":false,"explanation":"Vaccines are not hosts for infection. The relevant reduction is in the number of susceptible people available for the pathogen to infect."}]},{"id":"4d20b8ba-5f67-471c-90e9-b0a7f927cef0","cardType":"basic","points":2,"front":"Who does herd immunity protect besides vaccinated people?","back":"It protects people who cannot be vaccinated, such as very young babies or people who are already ill.","mcqOptions":[{"text":"It protects people who cannot be vaccinated, such as very young babies or people who are already ill.","correct":true,"explanation":"Herd immunity reduces transmission around vulnerable people who cannot receive vaccines, including very young babies and some people who are already ill."},{"text":"It protects people who refuse to be vaccinated, such as healthy adults or older children.","correct":false,"explanation":"Herd immunity may indirectly reduce exposure for unvaccinated people, but this answer gives different examples from the specifically vulnerable people described."},{"text":"It protects people who have already recovered, such as vaccinated adults or older children.","correct":false,"explanation":"People who have recovered may already have immunity, so they are not the key group herd immunity protects. It protects those who cannot be vaccinated."},{"text":"It protects people who are already immune, such as healthy adults or older children.","correct":false,"explanation":"Already immune people generally need no additional protection from herd immunity. The benefit is mainly for people unable to receive vaccination."}]},{"id":"f82c72fc-99ea-44ac-ab7d-0fa0f079d3f8","cardType":"basic","points":3,"front":"What has widespread vaccination done to polio, measles and smallpox?","back":"

Polio and measles have been made rare.
Smallpox has been wiped out worldwide.

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

Polio and measles have been made rare.
Smallpox has been wiped out worldwide.

","correct":true,"explanation":"Widespread vaccination has made polio and measles rare, while smallpox has been eradicated worldwide through successful global vaccination programmes."},{"text":"

Polio and measles have been wiped out worldwide.
Smallpox has been made rare.

","correct":false,"explanation":"Smallpox, rather than polio and measles, has been wiped out worldwide. Vaccination has reduced polio and measles to rare diseases."},{"text":"

Polio and smallpox have been made rare.
Measles has been wiped out worldwide.

","correct":false,"explanation":"Measles has not been wiped out worldwide, and smallpox is the disease eradicated globally. Polio and measles have been made rare."},{"text":"

Measles and smallpox have been wiped out worldwide.
Polio has been made common.

","correct":false,"explanation":"Smallpox alone has been wiped out worldwide; measles remains present, and vaccination has reduced polio rather than making it common."}]},{"id":"3696c302-72eb-4f0c-bd09-a535c11629b7","cardType":"cloze","points":null,"front":"Vaccination teaches the immune system to fight a pathogen before exposure to the [ ].","back":"Vaccination teaches the immune system to fight a pathogen before exposure to the live pathogen.","mcqOptions":[{"text":"live pathogen","correct":true,"explanation":"Vaccination prepares the immune system before exposure to the live pathogen, so memory cells can trigger a rapid response when the real infection occurs."},{"text":"dead pathogen","correct":false,"explanation":"The dead or inactive pathogen is used in the vaccine itself. The immune system is trained before later exposure to the live pathogen."},{"text":"matching antibody","correct":false,"explanation":"Matching antibodies are produced after vaccination, but the later exposure described is to the live pathogen that those antibodies target."},{"text":"harmless antigen","correct":false,"explanation":"A harmless antigen is part of the vaccine and stimulates immunity. The sentence refers to later exposure to the live pathogen."}]},{"id":"305e7afe-bc76-4aa0-83d7-b8a8e4a6cf69","cardType":"cloze","points":null,"front":"The first response takes a few [ ] because matching lymphocytes must be found and multiply.","back":"The first response takes a few days because matching lymphocytes must be found and multiply.","mcqOptions":[{"text":"days","correct":true,"explanation":"The first immune response takes a few days because matching lymphocytes must be found and multiply before enough specific antibodies are produced."},{"text":"hours","correct":false,"explanation":"The primary response is slower than an immediate reaction because matching lymphocytes need time to be found and multiply. The expected timescale is a few days."},{"text":"weeks","correct":false,"explanation":"Weeks exaggerates the usual delay for the first response. Matching lymphocytes generally multiply over a few days before producing the antibody response."},{"text":"months","correct":false,"explanation":"Months is far too long for the initial antibody response. The first response takes a few days while matching lymphocytes are found and multiply."}]},{"id":"761aedf5-e098-43c0-affa-1528b328f2c7","cardType":"cloze","points":null,"front":"Memory cells make the correct antibodies [ ] when the same pathogen returns.","back":"Memory cells make the correct antibodies quickly when the same pathogen returns.","mcqOptions":[{"text":"quickly","correct":true,"explanation":"Memory cells allow a much faster antibody response when the same pathogen returns, helping destroy it before noticeable symptoms develop."},{"text":"slowly","correct":false,"explanation":"Memory cells cause antibodies to be produced rapidly, not slowly, during a second infection because the immune system remembers the pathogen."},{"text":"randomly","correct":false,"explanation":"Antibodies are produced rapidly and specifically against the returning pathogen; memory cells do not make their production random."},{"text":"weakly","correct":false,"explanation":"Memory cells produce a faster and stronger antibody response, rather than a weak one, when the same pathogen infects the body again."}]},{"id":"08e6d9b2-0411-4182-9501-b4e4a2121116","cardType":"cloze","points":null,"front":"When a large enough proportion of a population is immune and a disease cannot spread easily, this is called [ ].","back":"When a large enough proportion of a population is immune and a disease cannot spread easily, this is called herd immunity.","mcqOptions":[{"text":"herd immunity","correct":true,"explanation":"Herd immunity occurs when enough people are immune that a pathogen cannot spread easily, helping protect individuals who are not immune."},{"text":"natural selection","correct":false,"explanation":"Natural selection is the change in inherited characteristics of a population over generations, whereas reduced disease spread among immune people is herd immunity."},{"text":"antibiotic resistance","correct":false,"explanation":"Antibiotic resistance is when bacteria survive antibiotic treatment; protection created by a high proportion of immune people is called herd immunity."},{"text":"passive immunity","correct":false,"explanation":"Passive immunity comes from receiving antibodies made elsewhere, while population-level protection that limits disease spread is known as herd immunity."}]},{"id":"207dfdb3-a25d-4e72-bf23-a16652fadb73","cardType":"cloze","points":null,"front":"If too few people are vaccinated, [ ] is lost and outbreaks can return.","back":"If too few people are vaccinated, herd immunity is lost and outbreaks can return.","mcqOptions":[{"text":"herd immunity","correct":true,"explanation":"Herd immunity depends on a sufficiently high proportion of vaccinated or immune people, so reducing vaccination can allow transmission and outbreaks to return."},{"text":"natural selection","correct":false,"explanation":"Natural selection changes populations over generations; the population protection lost when vaccination falls is herd immunity, which normally limits pathogen transmission."},{"text":"antibiotic resistance","correct":false,"explanation":"Antibiotic resistance concerns bacteria surviving antibiotics, not protection within a population. The protection reduced vaccination can remove is herd immunity."},{"text":"active immunity","correct":false,"explanation":"Active immunity is protection developed by producing antibodies after vaccination or infection, while population-wide reduced spread is specifically herd immunity."}]},{"id":"b62006f7-6732-40f2-a92f-cfa9fb85d247","cardType":"cloze","points":null,"front":"After the measles vaccine, memory cells remain in the [ ].","back":"After the measles vaccine, memory cells remain in the blood.","mcqOptions":[{"text":"blood","correct":true,"explanation":"Memory cells formed after vaccination remain in the blood and can recognise the measles pathogen, allowing a rapid antibody response if it returns."},{"text":"lungs","correct":false,"explanation":"The lungs may be infected by measles, but vaccine-generated memory cells remain in the blood rather than being stored specifically in the lungs."},{"text":"stomach","correct":false,"explanation":"The stomach is part of the digestive system and is not where measles vaccine memory cells remain; they circulate and persist in the blood."},{"text":"skin","correct":false,"explanation":"Skin provides a physical barrier against pathogens, but measles vaccine memory cells remain in the blood, where they support a rapid secondary response."}]}]}],"examCountdown":{"examDate":"2027-05-11","paperLabel":"Paper 1"},"heading":"3.1.7 Vaccination","title":"3.1.7 Vaccination Flashcards","topbar":{"backHref":"/gcse/biology/aqa/flashcards"},"topicSidebar":"$L38"}]}],"topicId":"84b244b7-3c41-510c-b84b-acffb7b56e8f","walled":"$L39"}],"$L3a","$L3b"]