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Respiration exam questions AQA A2 BIOLOGY 2023 with 100% correct answers
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---8March 20232022/2023A+
- Respiration exam questions AQA A2 BIOLOGY 2023 
 
 
Describe how acetylcoenzyme A is formed in the link reaction. (2) - ANSWER-1. Oxidation of / hydrogen removed from pyruvate and carbon dioxide released; 
 
2. Addition of coenzyme A. 
 
In the Krebs cycle, acetylcoenzyme A combines with four-carbon oxaloacetate to form six-carbon citrate 
 
This reaction is catalysed by the enzyme citrate synthase. 
 
(i) Oxaloacetate is the first substrate to bind with the enzyme citrate synthase. This induces...
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