Respiration (A-Level) — A-Level Biology Revision
Revise Respiration (A-Level) for A-Level Biology. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Photosynthesis (A-Level)What is Respiration (A-Level)?
Respiration is the process that releases energy from glucose in cells, making it available for all life processes. A-Level Biology focuses on aerobic respiration, which involves four main stages: glycolysis in the cytoplasm, the link reaction and the Krebs cycle in the mitochondrial matrix, and oxidative phosphorylation on the inner mitochondrial membrane. This process yields a large amount of ATP, the universal energy currency of cells.
Board notes: All A-Level Biology boards (AQA, Edexcel, OCR) cover the four stages of aerobic respiration in detail. The specific number of ATP molecules produced at each stage and the names of the intermediate compounds in the Krebs cycle may have minor variations in emphasis between boards.
Step-by-step explanationWorked example
In aerobic respiration, the theoretical maximum yield of ATP from one molecule of glucose is around 38 ATP. However, the actual yield is usually lower, around 30-32 ATP. This is because some ATP is used to transport pyruvate into the mitochondria, and some energy is lost as heat.
Mini lesson for Respiration (A-Level)
1. Understand the core idea
Respiration is the process that releases energy from glucose in cells, making it available for all life processes. A-Level Biology focuses on aerobic respiration, which involves four main stages: glycolysis in the cytoplasm, the link reaction and the Krebs cycle in the mitochondrial matrix, and oxidative phosphoryla...
Can you explain Respiration (A-Level) without copying the notes?
2. Turn it into marks
In aerobic respiration, the theoretical maximum yield of ATP from one molecule of glucose is around 38 ATP. However, the actual yield is usually lower, around 30-32 ATP.
Underline the method, evidence, or command-word move that would earn credit in A-Level Energy Transfers.
3. Fix the likely mark leak
Watch for this mistake: Confusing respiration with breathing. Breathing (or gas exchange) is the physical process of taking in oxygen and releasing carbon dioxide, while respiration is the chemical process that releases energy from food inside cells.
Write one correction rule before doing another practice question.
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Respiration (A-Level) practice questions
These are original StudyVector questions for revision practice. They are not official exam-board questions.
Question 1
In one A-Level sentence, explain what Respiration (A-Level) is testing.
Answer: Respiration is the process that releases energy from glucose in cells, making it available for all life processes. A-Level Biology focuses on aerobic respiration, which involves four main stages: glycolysis in the cytoplasm, the link reaction and the Krebs cycle in the mitochondrial matrix, and o...
Mark focus: Precise definition and topic focus.
Question 2
A Respiration (A-Level) question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Confusing respiration with breathing. Breathing (or gas exchange) is the physical process of taking in oxygen and releasing carbon dioxide, while respiration is the chemical process that releases energy from food inside cells." What should their next repair task be?
Answer: Do one Respiration (A-Level) question and review the mistake type.
Mark focus: Error correction and next-step practice.
Respiration (A-Level) flashcards
Core idea
What is the main idea in Respiration (A-Level)?
Respiration is the process that releases energy from glucose in cells, making it available for all life processes. A-Level Biology focuses on aerobic respiration, which involves four main stages: glycolysis in the cyt...
Common mistake
What mistake should you avoid in Respiration (A-Level)?
Confusing respiration with breathing. Breathing (or gas exchange) is the physical process of taking in oxygen and releasing carbon dioxide, while respiration is the chemical process that releases energy from food insi...
Practice
What is one useful practice task for Respiration (A-Level)?
Answer one Respiration (A-Level) question and review the mistake type.
Exam board
How should you use board notes for Respiration (A-Level)?
All A-Level Biology boards (AQA, Edexcel, OCR) cover the four stages of aerobic respiration in detail. The specific number of ATP molecules produced at each stage and the names of the intermediate compounds in the Kre...
Common mistakes
- 1Confusing respiration with breathing. Breathing (or gas exchange) is the physical process of taking in oxygen and releasing carbon dioxide, while respiration is the chemical process that releases energy from food inside cells.
- 2Not knowing the specific locations of each stage. Glycolysis occurs in the cytoplasm, the link reaction and Krebs cycle are in the mitochondrial matrix, and oxidative phosphorylation takes place on the inner mitochondrial membrane (cristae).
- 3Forgetting the roles of NAD and FAD. These are coenzymes that act as hydrogen carriers. They are reduced during glycolysis, the link reaction, and the Krebs cycle, and then carry the hydrogen atoms to the electron transport chain for oxidative phosphorylation.
Respiration (A-Level) exam questions
Exam-style questions for Respiration (A-Level) with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Respiration (A-Level)
Core concept
Respiration is the process that releases energy from glucose in cells, making it available for all life processes. A-Level Biology focuses on aerobic respiration, which involves four main stages: glyc…
Frequently asked questions
What is the difference between aerobic and anaerobic respiration?
Aerobic respiration requires oxygen and produces a large amount of ATP. Anaerobic respiration does not require oxygen and produces a much smaller amount of ATP, along with lactate (in animals) or ethanol and carbon dioxide (in plants and yeast).
What is oxidative phosphorylation?
Oxidative phosphorylation is the final stage of aerobic respiration, where the energy carried by electrons from reduced NAD and FAD is used to generate a large amount of ATP. It involves the electron transport chain and chemiosmosis.