CAIE A-Level Biology A2 12.2.3 Pyruvate and the Link Reaction Questions
Explain pyruvate formation and the link reaction using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Exam points
- Explain pyruvate formation and the link reaction connecting glycolysis to the Krebs cycle.
CAIE A-Level Biology A2 12.2.3 Pyruvate and the Link Reaction Questions question 1
[Maximum number: 3]
Pyruvate can enter the mitochondrion by active transport.
Describe the main conditions that are required for pyruvate to enter the mitochondrion by active transport.
any three from:
1 (inner) mitochondrial membrane impermeable (to pyruvate) ;
2 carrier (protein) ;
A symport / MPC (mitochondrial pyruvate carrier)
3 lower concentration of pyruvate outside mitochondrion ora or against concentration gradient ;
4 oxygen available ;
5 ATP / energy ;
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