4.1 Glycolysis

Question 1

Glycolysis:

Occurs in?
What phosphorylation?
First stage of?

Answer 1

Cytoplasm
Substrate-level phosphorylation
Aerobic and anaerobic respiration

Question 2

Energy yields from glycolysis
One glucose molecule (3)
Enters either? (2)

Answer 2

2 molecules ATP (Four produced, but two used up in phosphorylation of glucose)
2 molecules NADH
2 molecules pyruvate

Link reaction and Krebs cycle (aerobic respiration)
Fermentation (anaerobic respiration)

Question 3

1. Activation of glucose by phosphorylation (2)
2. Splitting of phosphorylated glucose
3. Oxidation of triose phosphate (2)
4. Production of ATP (2)

Answer 3

2 phosphate molecules added to glucose to make it more reactive/lower AE
-Phosphate molecules come from the hydrolysis of 2 ATP molecules to ADP+Pi.

Each 6-carbon glucose molecule split into 2 3-carbon triose phosphate molecules.

2 hydrogens are removed from each triose phosphate molecule
-Transferred to NAD to form NADH

3-carbon triose phosphate molecule converted into 3-carbon pyruvate molecule by enzyme-controlled reactions.
-4 molecules of ATP regenerated from 4 molecules of ADP+Pi.