5.2 Respiration

Question 1

describe how acetylcoenzymeA is formed in the link reaction (2)

Answer 1

Pyruvate is oxidised and co2 is released
coenzyme A is added

Question 2

describe the role of coenzymes and carrier proteins in the synthesis of ATP (6)

Answer 2

Reduced NAD and FAD take hydrogen to carrier proteins

Hydrogen ions passed into innermembrane space

electrons transferred from conenzyme to carrier protein in a series of redox reactions

more hydrogen ions pass into innermembrane space

hydrogen Ions flow back through ATP synthase enzyme

energy used to synthase ATP from ADP + Pi

Question 3

Describe the process of Glycolysis (4)

Answer 3

1. phosphorylation of glucose using ATP
2. oxidation of triose phosphate to pyruvate
3. net gain of ATP (4 made 2 used)
4. NAD reduced (NAD to NADH)

Question 4

describe how ATP is made in the mitocondria (6)

Answer 4

ATP produced in krebs cycle
Krebs cycle produced reduced NAD
electrons are released from reduced NAD
electrons pass through electron transport chain in a series of redox reactions
energy is released
protons move into inner membrane space
ADP + Pi to ATP by ATP synthase