Respiration is one of the biggest topics you will cover in A Level Biology—and it will come up in the exam, guaranteed.

The purpose of the Krebs Cycle is to release stored energy from a series of chemical reactions. In the exam you are expected to know all the little details:

a) acetylcoenzyme A reacts with a fourcarbon molecule, releasing coenzyme A
b) and produces a sixcarbon molecule that enters the Krebs cycle in a series of oxidationreduction reactions,
c) the Krebs cycle generates reduced coenzymes and ATP by substratelevel phosphorylation,
d) and carbon dioxide is lost.

This is for all A Level Biology AQA, OCR & Edexcel Students.

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