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living cell.","correct":false,"explanation":"Oxygen may be needed for aerobic respiration, but it is not the energy source. Respiration transfers energy from glucose in every living cell."},{"text":"Carbon dioxide in every living cell.","correct":false,"explanation":"Carbon dioxide is a waste product of aerobic respiration, not the molecule whose energy is transferred. The correct source is glucose in every living cell."},{"text":"Water in every living cell.","correct":false,"explanation":"Water can be produced during aerobic respiration, but it does not provide the transferred energy. Respiration releases energy from glucose in every living cell."}]},{"id":"60f5bbb4-e8cf-49c3-9737-0d418832f822","cardType":"basic","points":2,"front":"Why is respiration described as an exothermic reaction?","back":"It transfers energy to the surroundings.","mcqOptions":[{"text":"It transfers energy to the surroundings.","correct":true,"explanation":"An exothermic reaction releases energy to its surroundings. Respiration transfers some of the chemical energy in glucose to the surroundings as heat."},{"text":"It transfers energy from the surroundings.","correct":false,"explanation":"Taking in energy from the surroundings describes an endothermic process. Respiration is exothermic because it transfers energy to the surroundings."},{"text":"It stores energy in the surroundings.","correct":false,"explanation":"Respiration does not store energy in the surroundings. It is exothermic because energy is released and transferred to the surroundings."},{"text":"It transfers glucose to the surroundings.","correct":false,"explanation":"The reaction does not transfer glucose as its defining effect. It is described as exothermic because it transfers energy to the surroundings."}]},{"id":"0e7cee94-1da3-4c7d-89f2-96f4d7d3ea3c","cardType":"basic","points":3,"front":"What three processes do organisms use energy from respiration for?","back":"

Building larger molecules
Movement
Keeping warm in mammals and birds

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

Building larger molecules
Movement
Keeping warm in mammals and birds

","correct":true,"explanation":"Energy from respiration powers synthesis of larger molecules, movement, and heat production that helps mammals and birds maintain their body temperature."},{"text":"

Breaking down larger molecules
Movement
Keeping warm in mammals and birds

","correct":false,"explanation":"Respiration energy is used to build larger molecules, rather than mainly breaking them down. Movement and keeping warm are also valid uses."},{"text":"

Building larger molecules
Digestion
Keeping warm in mammals and birds

","correct":false,"explanation":"Digestion breaks food into smaller soluble molecules and is not one of the listed uses here. Respiration energy supports building larger molecules, movement, and warmth."},{"text":"

Building larger molecules
Movement
Cooling in mammals and birds

","correct":false,"explanation":"Respiration can release heat, helping mammals and birds keep warm; it does not provide energy specifically for cooling. Building molecules and movement are correct uses."}]},{"id":"b08c3a01-a618-48c4-bc54-4fd997e0a9ea","cardType":"basic","points":2,"front":"What is the key difference between respiration and breathing?","back":"Respiration is a chemical reaction inside cells; breathing is not.","mcqOptions":[{"text":"Respiration is a chemical reaction inside cells; breathing is not.","correct":true,"explanation":"Respiration is the chemical process that releases energy from glucose inside cells. Breathing is the physical movement of air into and out of the lungs."},{"text":"Respiration is a physical movement of air inside cells; breathing is not.","correct":false,"explanation":"The processes have been reversed. Breathing involves physical air movement, whereas respiration is a chemical reaction inside cells."},{"text":"Respiration is a chemical reaction outside cells; breathing is not.","correct":false,"explanation":"Respiration takes place inside living cells, not outside them. Breathing is a separate physical process involving movement of air."},{"text":"Respiration is a gas exchange inside cells; breathing is not.","correct":false,"explanation":"Gas exchange and breathing help supply oxygen and remove carbon dioxide, but respiration itself is a chemical reaction inside cells."}]},{"id":"87ec8430-dc05-4bd7-886d-445747b36831","cardType":"basic","points":1,"front":"Where does aerobic respiration take place mainly?","back":"In the mitochondria.","mcqOptions":[{"text":"In the mitochondria.","correct":true,"explanation":"Aerobic respiration takes place mainly in mitochondria, the cell structures where most of the energy-releasing reactions using oxygen occur."},{"text":"In the ribosomes.","correct":false,"explanation":"Ribosomes make proteins, not the main site of aerobic respiration. Aerobic respiration takes place mainly in the mitochondria."},{"text":"In the nucleus.","correct":false,"explanation":"The nucleus contains genetic material and controls cell activities, but it is not the main site of aerobic respiration. That is the mitochondria."},{"text":"In the cell membrane.","correct":false,"explanation":"The cell membrane controls movement of substances into and out of the cell. Most aerobic respiration takes place in the mitochondria."}]},{"id":"0db56ea8-2a1d-4c98-88b5-860a4595206f","cardType":"basic","points":1,"front":"What are the products of aerobic respiration?","back":"Carbon dioxide and water.","mcqOptions":[{"text":"Carbon dioxide and water.","correct":true,"explanation":"Aerobic respiration uses glucose and oxygen and produces carbon dioxide and water, while transferring energy for cellular processes."},{"text":"Oxygen and water.","correct":false,"explanation":"Oxygen is a reactant consumed during aerobic respiration, not a product. The products are carbon dioxide and water."},{"text":"Carbon dioxide and glucose.","correct":false,"explanation":"Glucose is the fuel broken down during respiration, so it is a reactant rather than a product. Aerobic respiration produces carbon dioxide and water."},{"text":"Lactic acid and water.","correct":false,"explanation":"Lactic acid is produced by anaerobic respiration in muscles. Aerobic respiration produces carbon dioxide and water."}]},{"id":"8cd4e4ca-a1bf-42e6-8868-b9b172e4135b","cardType":"basic","points":1,"front":"What is the word equation for aerobic respiration?","back":"Glucose + oxygen → carbon dioxide + water.","mcqOptions":[{"text":"Glucose + oxygen → carbon dioxide + water.","correct":true,"explanation":"The word equation shows glucose reacting with oxygen during aerobic respiration to form carbon dioxide and water, with energy released."},{"text":"Glucose + carbon dioxide → oxygen + water.","correct":false,"explanation":"This reverses the roles of oxygen and carbon dioxide. Aerobic respiration uses glucose and oxygen and produces carbon dioxide and water."},{"text":"Glucose → lactic acid + energy.","correct":false,"explanation":"This represents anaerobic respiration in muscles more closely, not aerobic respiration. Aerobic respiration uses oxygen and produces carbon dioxide and water."},{"text":"Carbon dioxide + water → glucose + oxygen.","correct":false,"explanation":"This is the reverse direction associated with photosynthesis, not respiration. Aerobic respiration breaks down glucose using oxygen to form carbon dioxide and water."}]},{"id":"2a78b4aa-9f45-461c-8832-12318d37d1f4","cardType":"basic","points":1,"front":"What is the symbol equation for aerobic respiration?","back":"$$C_6H_{12}O_6 + 6O_2 \\rightarrow 6CO_2 + 6H_2O$","mcqOptions":[{"text":"$$C_6H_{12}O_6 + 6O_2 \\rightarrow 6CO_2 + 6H_2O$","correct":true,"explanation":"This symbol equation is balanced: one glucose molecule reacts with six oxygen molecules to produce six carbon dioxide and six water molecules."},{"text":"$$C_6H_{12}O_6 + 6CO_2 \\rightarrow 6O_2 + 6H_2O$","correct":false,"explanation":"Carbon dioxide has been incorrectly used as a reactant and oxygen as a product. Aerobic respiration uses oxygen and produces carbon dioxide."},{"text":"$$C_6H_{12}O_6 + 3O_2 \\rightarrow 3CO_2 + 3H_2O$","correct":false,"explanation":"The coefficients are too small to balance the atoms in glucose. Six oxygen, six carbon dioxide, and six water molecules are required."},{"text":"$$C_6H_{12}O_6 + 6O_2 \\rightarrow 6CO_2 + 12H_2O$","correct":false,"explanation":"The water coefficient is doubled, creating too many hydrogen atoms among the products. A balanced equation has six water molecules."}]},{"id":"a9447007-3100-4602-a51c-738fd08ae65a","cardType":"basic","points":1,"front":"What product is made by anaerobic respiration in muscles?","back":"Lactic acid.","mcqOptions":[{"text":"Lactic acid.","correct":true,"explanation":"When muscles respire anaerobically, glucose is only partly broken down and lactic acid is produced."},{"text":"Ethanol.","correct":false,"explanation":"Ethanol is produced during anaerobic respiration in plants and yeast, not in human muscle cells. Muscles produce lactic acid."},{"text":"Carbon dioxide.","correct":false,"explanation":"Carbon dioxide is produced during anaerobic respiration in plants and yeast, but not as the muscle product. Muscles produce lactic acid."},{"text":"Oxygen.","correct":false,"explanation":"Anaerobic respiration occurs without oxygen and does not produce it as the muscle product. The product made in muscles is lactic acid."}]},{"id":"639f301e-7a43-40c1-a4c2-238c4c57f961","cardType":"basic","points":2,"front":"Why does anaerobic respiration transfer much less energy than aerobic respiration?","back":"Glucose is broken down only partly.","mcqOptions":[{"text":"Glucose is broken down only partly.","correct":true,"explanation":"Without oxygen, anaerobic respiration cannot completely break down glucose, so less energy is released than during aerobic respiration."},{"text":"Glucose is broken down completely.","correct":false,"explanation":"Complete glucose breakdown is characteristic of aerobic respiration. Anaerobic respiration transfers less energy because glucose is broken down only partly."},{"text":"Glucose is made only partly.","correct":false,"explanation":"Anaerobic respiration breaks glucose down rather than making it. Its lower energy transfer results from only partial breakdown of glucose."},{"text":"Oxygen is broken down only partly.","correct":false,"explanation":"Oxygen is not the molecule being partially broken down in this explanation. Anaerobic respiration releases less energy because glucose is only partly broken down."}]},{"id":"b56d44b2-4fa3-431d-b5ec-818b85f2d32e","cardType":"basic","points":1,"front":"What products are made by anaerobic respiration in plants and yeast?","back":"Ethanol and carbon dioxide.","mcqOptions":[{"text":"Ethanol and carbon dioxide.","correct":true,"explanation":"Anaerobic respiration in plants and yeast produces ethanol and carbon dioxide when glucose is broken down without oxygen."},{"text":"Lactic acid and carbon dioxide.","correct":false,"explanation":"Lactic acid is the anaerobic product in animal muscles. Plants and yeast produce ethanol and carbon dioxide."},{"text":"Ethanol and oxygen.","correct":false,"explanation":"Anaerobic respiration does not use or produce oxygen in this process. Plants and yeast produce ethanol and carbon dioxide."},{"text":"Carbon dioxide and water.","correct":false,"explanation":"Carbon dioxide and water are the products of aerobic respiration. Anaerobic respiration in plants and yeast produces ethanol and carbon dioxide."}]},{"id":"d0840773-9a45-496d-84bf-7e3ae339ec08","cardType":"basic","points":1,"front":"What is anaerobic respiration in yeast called?","back":"Fermentation.","mcqOptions":[{"text":"Fermentation.","correct":true,"explanation":"Anaerobic respiration in yeast is called fermentation. It produces ethanol and carbon dioxide from glucose without using oxygen."},{"text":"Photosynthesis.","correct":false,"explanation":"Photosynthesis uses light energy to make glucose from carbon dioxide and water. Yeast anaerobic respiration is called fermentation."},{"text":"Transpiration.","correct":false,"explanation":"Transpiration is the loss of water vapour from plant leaves, not anaerobic respiration in yeast. The correct term is fermentation."},{"text":"Digestion.","correct":false,"explanation":"Digestion breaks large food molecules into smaller soluble molecules. Anaerobic respiration in yeast, producing ethanol and carbon dioxide, is fermentation."}]},{"id":"3f2a78f5-10cc-424f-8600-801aa15d62bc","cardType":"basic","points":2,"front":"Why is fermentation economically important?","back":"It is used to make bread and alcoholic drinks.","mcqOptions":[{"text":"It is used to make bread and alcoholic drinks.","correct":true,"explanation":"Yeast fermentation releases carbon dioxide, making dough rise, and produces ethanol, which is used in alcoholic drinks."},{"text":"It is used to make bread and oxygen drinks.","correct":false,"explanation":"Fermentation produces ethanol for alcoholic drinks, not oxygen drinks. Its economic uses include bread-making and alcoholic-drink production."},{"text":"It is used to make proteins and alcoholic drinks.","correct":false,"explanation":"Fermentation is not the main process used to manufacture proteins in this context. It is economically important for making bread and alcoholic drinks."},{"text":"It is used to make bread and lactic acid medicines.","correct":false,"explanation":"Yeast fermentation produces ethanol and carbon dioxide, not lactic acid. Its key economic applications are bread and alcoholic drinks."}]},{"id":"e258ccb2-c6a6-462d-8b31-edfbd3907e72","cardType":"basic","points":2,"front":"How does yeast fermentation make bread dough rise?","back":"Fermentation releases carbon dioxide, which makes the dough rise.","mcqOptions":[{"text":"Fermentation releases carbon dioxide, which makes the dough rise.","correct":true,"explanation":"Yeast ferments sugar anaerobically and releases carbon dioxide gas. Bubbles of this gas become trapped in the dough, increasing its volume."},{"text":"Fermentation releases oxygen, which makes the dough rise.","correct":false,"explanation":"Yeast fermentation releases carbon dioxide, not oxygen. Carbon dioxide bubbles become trapped in the dough and make it expand."},{"text":"Fermentation releases ethanol, which makes the dough rise.","correct":false,"explanation":"Ethanol is also produced, but it does not make the dough rise. Carbon dioxide gas forms bubbles that increase the dough's volume."},{"text":"Fermentation absorbs carbon dioxide, which makes the dough rise.","correct":false,"explanation":"Fermentation releases rather than absorbs carbon dioxide. The released gas forms bubbles trapped in the dough, causing it to rise."}]},{"id":"fd994348-95d4-4f8d-80ee-77ea33b1b9cf","cardType":"basic","points":3,"front":"How do aerobic and anaerobic respiration differ in oxygen use, glucose breakdown and energy transfer?","back":"

Aerobic uses oxygen; anaerobic does not
Aerobic breaks glucose down completely; anaerobic only partly
Aerobic transfers much more energy

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

Aerobic uses oxygen; anaerobic does not
Aerobic breaks glucose down completely; anaerobic only partly
Aerobic transfers much more energy

","correct":true,"explanation":"Aerobic respiration uses oxygen, completely breaks down glucose, and releases much more energy. Anaerobic respiration occurs without oxygen and only partly breaks down glucose."},{"text":"

Aerobic uses oxygen; anaerobic does not
Aerobic breaks glucose down partly; anaerobic completely
Aerobic transfers much more energy

","correct":false,"explanation":"The breakdown descriptions are reversed. Aerobic respiration completely breaks down glucose, whereas anaerobic respiration only partly breaks it down, so aerobic transfers much more energy."},{"text":"

Aerobic does not use oxygen; anaerobic does
Aerobic breaks glucose down completely; anaerobic only partly
Aerobic transfers much more energy

","correct":false,"explanation":"The oxygen requirement is reversed. Aerobic respiration uses oxygen, while anaerobic respiration does not; complete breakdown then allows aerobic respiration to transfer more energy."},{"text":"

Aerobic uses oxygen; anaerobic does not
Aerobic breaks glucose down completely; anaerobic only partly
Aerobic transfers the same amount of energy

","correct":false,"explanation":"The oxygen use and breakdown are correct, but the energy transfer is not equal. Partial glucose breakdown means anaerobic respiration transfers much less energy."}]},{"id":"5702fd31-a706-47dd-97f2-e984f71a2178","cardType":"basic","points":3,"front":"How do the products of anaerobic respiration differ between animals and plants or yeast?","back":"

Animals produce lactic acid
Plants and yeast produce ethanol and carbon dioxide

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

Animals produce lactic acid
Plants and yeast produce ethanol and carbon dioxide

","correct":true,"explanation":"Anaerobic respiration produces different end products: animal muscle cells make lactic acid, while plant and yeast cells make ethanol and carbon dioxide."},{"text":"

Animals produce ethanol and carbon dioxide
Plants and yeast produce lactic acid

","correct":false,"explanation":"The organism groups have been swapped. Animals produce lactic acid anaerobically, whereas plants and yeast produce ethanol and carbon dioxide."},{"text":"

Animals produce carbon dioxide
Plants and yeast produce lactic acid and water

","correct":false,"explanation":"Carbon dioxide alone is not the animal product, and plants and yeast do not produce lactic acid in this process. The correct products are lactic acid in animals, and ethanol plus carbon dioxide in plants and yeast."},{"text":"

Animals produce lactic acid
Plants and yeast produce carbon dioxide and water

","correct":false,"explanation":"The animal product is correct, but water is an aerobic respiration product. Plants and yeast produce ethanol and carbon dioxide during anaerobic respiration."}]},{"id":"26ec61c5-056c-45dd-b970-77c0ef2307b8","cardType":"cloze","points":null,"front":"Aerobic respiration takes place mainly in the [ ].","back":"Aerobic respiration takes place mainly in the mitochondria.","mcqOptions":[{"text":"mitochondria","correct":true,"explanation":"Mitochondria are the organelles where aerobic respiration mainly occurs, because they contain the enzymes and structures needed to release energy from glucose using oxygen."},{"text":"nucleus","correct":false,"explanation":"The nucleus stores genetic material and controls cell activities, but it is not the main site of aerobic respiration. The correct location is the mitochondria, where energy is released from glucose."},{"text":"cytoplasm","correct":false,"explanation":"The cytoplasm is involved in the first stage of glucose breakdown, but aerobic respiration mainly takes place in the mitochondria. Confusing the first stage with the whole process causes this choice."},{"text":"ribosomes","correct":false,"explanation":"Ribosomes make proteins and are not the site of aerobic respiration. The mitochondria carry out most aerobic respiration because they contain the machinery for oxygen-dependent energy release."}]},{"id":"e65e9024-9bbb-42a9-a069-41c99acc5ef9","cardType":"cloze","points":null,"front":"Aerobic respiration uses [ ] to break glucose down completely.","back":"Aerobic respiration uses oxygen to break glucose down completely.","mcqOptions":[{"text":"oxygen","correct":true,"explanation":"Aerobic respiration requires oxygen to break glucose down completely, releasing a larger amount of energy and producing carbon dioxide and water."},{"text":"carbon dioxide","correct":false,"explanation":"Carbon dioxide is a waste product of aerobic respiration, not the substance used to break glucose down. Oxygen is the reactant required for complete breakdown and energy release."},{"text":"nitrogen","correct":false,"explanation":"Nitrogen is abundant in air but is not used in aerobic respiration to break down glucose. Oxygen is the gas needed for complete glucose breakdown."},{"text":"water","correct":false,"explanation":"Water is produced during aerobic respiration rather than used to break glucose down completely. The required reactant is oxygen, which allows the full release of energy from glucose."}]},{"id":"5cfeecab-c58f-4500-883b-47e6604392ea","cardType":"cloze","points":null,"front":"Anaerobic respiration in muscles occurs when muscles cannot get enough [ ].","back":"Anaerobic respiration in muscles occurs when muscles cannot get enough oxygen.","mcqOptions":[{"text":"oxygen","correct":true,"explanation":"Muscles use anaerobic respiration when their oxygen supply cannot meet demand, such as during vigorous exercise. This allows some energy release but produces lactic acid."},{"text":"glucose","correct":false,"explanation":"Glucose is the fuel muscles break down to release energy, so it is still needed during anaerobic respiration. The limiting substance is oxygen, which becomes insufficient during vigorous activity."},{"text":"carbon dioxide","correct":false,"explanation":"Carbon dioxide is a waste product associated with aerobic respiration, not the substance muscles need to obtain before anaerobic respiration begins. Insufficient oxygen triggers the anaerobic pathway."},{"text":"lactic acid","correct":false,"explanation":"Lactic acid is produced when muscles respire anaerobically; it is not the substance they fail to obtain. Anaerobic respiration occurs because the muscles cannot get enough oxygen."}]},{"id":"83cbff4d-47ad-4f07-84aa-7e9f91121020","cardType":"cloze","points":null,"front":"In anaerobic respiration, glucose is broken down [ ].","back":"In anaerobic respiration, glucose is broken down incompletely.","mcqOptions":[{"text":"incompletely","correct":true,"explanation":"Anaerobic respiration breaks glucose down incompletely because oxygen is unavailable or insufficient. Consequently, it releases less energy and leaves products such as lactic acid or ethanol."},{"text":"completely","correct":false,"explanation":"Complete glucose breakdown requires aerobic respiration and oxygen. Anaerobic respiration breaks glucose down incompletely, so less energy is released and additional products remain."},{"text":"rapidly","correct":false,"explanation":"Anaerobic respiration can occur rapidly, but speed is not the defining feature of glucose breakdown. The key difference is that glucose is broken down incompletely without enough oxygen."},{"text":"reversibly","correct":false,"explanation":"Whether the reactions are reversible does not describe the defining breakdown of glucose in anaerobic respiration. The correct description is incomplete breakdown, which releases less energy."}]},{"id":"10c288fb-5d74-4bba-95f4-3d445900b543","cardType":"cloze","points":null,"front":"In yeast, anaerobic respiration produces [ ] and carbon dioxide.","back":"In yeast, anaerobic respiration produces ethanol and carbon dioxide.","mcqOptions":[{"text":"ethanol","correct":true,"explanation":"Yeast carries out anaerobic respiration by converting glucose into ethanol and carbon dioxide. This process is called fermentation and is useful in producing bread and alcoholic drinks."},{"text":"lactic acid","correct":false,"explanation":"Lactic acid is produced by anaerobic respiration in animal muscle cells, not by yeast. Yeast fermentation produces ethanol and carbon dioxide from glucose."},{"text":"oxygen","correct":false,"explanation":"Oxygen is used in aerobic respiration and is absent or limited during yeast fermentation. Yeast anaerobically produces ethanol alongside carbon dioxide."},{"text":"water","correct":false,"explanation":"Water is a product associated with aerobic respiration, where glucose is completely broken down using oxygen. Yeast anaerobic respiration produces ethanol and carbon dioxide instead."}]},{"id":"d51eaf84-5c14-4525-bc7d-da3063898e1a","cardType":"cloze","points":null,"front":"Fermentation is used to make bread and [ ].","back":"Fermentation is used to make bread and alcoholic drinks.","mcqOptions":[{"text":"alcoholic drinks","correct":true,"explanation":"Fermentation by yeast produces ethanol, which is used in alcoholic drinks, while the carbon dioxide produced helps dough rise when making bread."},{"text":"soft drinks","correct":false,"explanation":"Soft drinks may contain dissolved carbon dioxide, but fermentation is not the process used to make them generally. Fermentation is used in bread-making and the production of alcoholic drinks."},{"text":"dairy products","correct":false,"explanation":"Some dairy products use bacterial fermentation, but this GCSE example refers specifically to yeast fermentation. Yeast is used to make bread and alcoholic drinks."},{"text":"fruit juices","correct":false,"explanation":"Fruit juice can be a starting material for fermentation, but it is not the product named in this statement. Fermentation is used to make bread and alcoholic drinks."}]}]}],"examCountdown":{"examDate":"2027-05-11","paperLabel":"Paper 1"},"heading":"4.2.1 Aerobic and anaerobic respiration","title":"4.2.1 Aerobic and anaerobic respiration Flashcards","topbar":{"backHref":"/gcse/biology/aqa/flashcards"},"topicSidebar":"$L38"}]}],"topicId":"c58e9d1e-b887-5157-a4e7-facb7ca5edb0","walled":"$L39"}],"$L3a","$L3b"]