7.2.3 - Glycolysis

Question 1

What Is Glycolysis?
(4 Points)

Answer 1

~ First stage of respiration.

~ Does not require oxygen.

~ Occurs in the cytoplasm.

~ Glucose, is only partially oxidised during this stage.

Question 2

What Does Glycolysis Involve?
(2 Points)

Answer 2

~ Trapping glucose in the cell, by phosphorylating the molecule.

~ Oxidising triode phosphate, by losing hydrogen.

Question 3

What Are The Products Of Glycolysis?
(3 Points)

Answer 3

~ 2x pyruvate (3C) molecules, which move into the matrix of the mitochondria to be used during the link reaction.

~ Net gain of 2 ATP.

~ 2x reduced NAD, which used during oxidative phosphorylation.

Question 4

What Does Glycolysis Produce, Under Anaerobic Conditions?

Answer 4

Produces lactic acid or lactate, instead of pyruvate.

Question 5

What Does Glycolysis Produce, Under Aerobic Conditions?

Answer 5

Pyruvate.

Question 6

What Are The 2 Stages Of Glycolysis?

Answer 6

~ Phosphorylation of glucose.

~ Oxidation of triose phosphate.

Question 7

Describe The Process Of ‘Phosphorylation Of Glucose’, As The 1st Stage Of Glycolysis
(2 Points)

Answer 7

~ Glucose is phosphorylated, by adding 2 phosphates from 2 molecules of ATP.

~ Producing, 2 molecules of triose phosphate, and 2 molecules of ADP.

Question 8

Describe The Process Of ‘Oxidation Of Triose Phosphate’, As The 2st Stage Of Glycolysis
(3 Points)

Answer 8

~ Triose phosphate is oxidised (Loss of hydrogen), forming 2 molecules of pyruvate.

~ NAD, collects the hydrogen ions, forming 2 reduced NAD.

~ 4 ATP are produced, but 2 were used to phosphorylate glucose, so there is a net gain of 2 ATP molecules.