Lesson 2- Stage 1: Glycolysis

Question 1

Where does glycolysis take place in the cell ?

Answer 1

Cell cytoplasm

Question 2

What happens during phosphorylation of Glucose ?

Answer 2

Glucose is phosphorylated by adding 2 phosphate groups from 2 ATP molecules

Question 3

What happens during oxidation in glycolysis ?

Answer 3

Triose phosphate is oxidised forming 2 pyruvate molecules. 2 NAD molecules are reduced to NADH

Question 4

How many ATP molecules are produced during glycolysis ?

Answer 4

4 ATP are produced but net gain is 2 ATP

Question 5

What is the only stage of respiration common to aerobic and anaerobic respiration ?

Answer 5

Glycolysis

Question 6

What are the products of glycolysis ?

Answer 6

2 molecules of pyruvate
2 red NAD
2 ATP

Question 7

Where do products of glycolysis go?

Answer 7

• 2 red NAD - goes to ETC

- 2 Pyruvate - Actively transported into mitochondria for link reaction

Question 8

Why is net gain of ATP in glycolysis only 2 ?

Answer 8

2 ATP are used to phosphorylate the glucose to make it more reactive, four ATP molecules are produced but net overall total is 2

Question 9

What happens to lactate after a period of aneroid respiration ?

Answer 9

Lactate is oxidised back into pyruvate. It is directly oxidised into CO2 and H2O via Krebs cycle. Some lactate is converted to glycogen and stored in muscle or liver cells

Question 10

What is oxygen debt?

Answer 10

The oxygen needed to oxidise lactic acid in period of recovery after excercise