3.5.2 Respiration

Question 1

What is the first stage of aerobic respiration?

Answer 1

glycolysis

Question 2

Where does glycolysis occur?

Answer 2

cytoplasm

Question 3

What happens in glycolysis?

Answer 3

-phosphorylation of glucose (adding phosphate) using 2 ATP
-production of 2 triose phosphate
-2 triose phosphate are oxidised to produce 2 pyruvate
-NAD is reduced to NADH (x2)

Question 4

What are the net products of glycolysis?

Answer 4

-2 ATP
-2 NADH
-2 pyruvate molecules

Question 5

How does pyruvate enter mitochondrial matrix?

Answer 5

via active transport

Question 6

What happens in the link reaction?

Answer 6

Pyruvate (3C) —> Acetate (2C) —> Acetyl coA (2C)
-NAD is reduced to NADH
-CO2 is released

Question 7

What is the purpose of the Krebs Cycle?

Answer 7

strips out excited electrons by reducing NAD and FAD and transports electrons to oxidative phosphorylation (where ATP is produced)

Question 8

Krebs Cycle

Answer 8

Acetyl coA (2C) + 4C —-> 6 carbon molecule —> 5 carbon molecule —> 4C + ……….

Question 9

What is produced in Krebs cycle?

Answer 9

-4 CO2 molecules
-2 ATP molecules
-6 NADH
-2 FADH