Respiration

Question 1

What are the 4 stages of respiration?

Answer 1

Glycolysis, link reaction, kerbs cycle and oxidative phosphorylation

Question 2

Where does the first stage of respiration occur?

Answer 2

Cypotplasm

Question 3

Where do all the stages (but the first) of respiration occur?

Answer 3

Mitochondria

Question 4

What happens in glycolysis?

Answer 4

Glucose molecule splits into 2 sampler molecules of pyruvate

Question 5

Does glycolysis need oxygen to take place?

Answer 5

No

Question 6

What is the intermediate molecule in glycolysis hydrolysed into?

Answer 6

2 TP molecules

Question 7

What is the overall yield of products from the glycolysis of one glucose molecule?

Answer 7

2 ATP, 2NADP and 2 pyruvate

Question 8

What are the 4 stages in glycolysis?

Answer 8

Phosphorylation of glucose to glucose phosphate
Splitting of phosphorylated glucose
Oxidation of TP
Production of ATP

Question 9

How does NAD become reduced NAD in glycolysis?

Answer 9

Protons are transferred to NAD when TP is oxidised

Question 10

What are the products of the link reaction?

Answer 10

2 carbon acetyl CoA, NADH2 and CO2

Question 11

What are the 3 stages of the link reaction?

Answer 11

Pyruvic acid is oxidised to Acetyl CoA
Decarboxylation
Enzyme A is recycled

Question 12

What product from the links reaction is vital for the kerbs cycle (it drives the kerb cycle)?

Answer 12

2 carbon acetyl CoA

Question 13

What are the overall products for one Cole of the kerbs reaction?

Answer 13

ATP, 2 CO2, 3 NADH2, 4 H2 and FADH2

Question 14

What are the steps involved in the Krebs Cycle?

Answer 14

Acetyl CoA is oxidised to citric acid
6 carbon citric acid is oxidised to 5 carbon ke to acid
5 carbon Leto acid is oxidised to 4 carbon succinic acid
4 carbon succinic acid is oxidised to 4 carbon malic acid
4 carbon malic acid is oxidised to 4 carbon oxaloacetic acid

Question 15

What happens to Acetyl CoA in the Krebs cycle?

Answer 15

It’s recycled back into the cycle

Question 16

What happens to the overall yield in the Krebs cycle when it’s per glucose?

Answer 16

Yield is doubled

Question 17

What is the product produced at the end of oxidative phosphorylation?

Answer 17

Water

Question 18

What are the stages of oxidative phosphorylation?

Answer 18

H atoms combine with NAD and FAD
Reduced NAD and FAD donate (H atom) electrons
Oxidation reduction reactions occur
Protons transfer from the inter-membran all space to the mitochondrial matrix
Electrons+protons+O2 combine to make water

Question 19

What is the final electron acceptor in the electron transfer chain?

Answer 19

O2

Question 20

Why is O2 so important in respiration?

Answer 20

Final electron acceptor and H atoms from Krebs and glycolysis. Without the removal of H atoms the chain would back up and respiration would halt.