Respiration

Question 1

Name the 4 main stages in aerobic respiration and where they occur.

Answer 1

Glycolysis: cytoplasm
Link reaction: mitochondrial matrix
Krebs cycle: mitochondrial matrix
Oxidative phosphorylation via ETC: membrane of cristae

Question 2

Outline the stages of glycolysis.

Answer 2

1. Glucose is phosphorylated to GP by 2x ATP
2. GP splits into 2x TP
3. 2x TP is oxidised to 2x pyruvate
   Net gain of 2x reduced NAD & 2x ATP per glucose

Question 3

How does pyruvate from glycolysis enter the mitochondria?

Answer 3

Via active transport

Question 4

What happens during the link reaction?

Answer 4

1. Oxidation of pyruvate to acetate.
   Per pyruvate molecule: net gain of 1xCO2 (decarboxylation) & 2H atoms (used to reduce 1xNAD)
2. Acetate combines with coenzyme A (CoA) to form acetylcoenzyme A.