Question

Pyruvic acid, the end product of glycolysis enters the mitochondria for further oxidation.
(i) Name the cycle it enters.
(ii) List any two end products of the cycle.
(iii) Mention the number of ATP produced at the end of one cycle.
(iv) Name the next phase which the hydrogen carriers produced during this cycle, enter &
why.

Answer 1

1.Kerbs cycle or citric acid cycle
2.Co2, and H2o along with 38 ATP energy
3.36 ATP +2ATP which was first produced during glycolisis
4. deoxycarbolisation with terminal oxidation.

Answer 2

ANSWER:

(i) Kreb’s cycle or citric acid cycle. Pyruvate from glycolysis is converted into acetyl CoA which is the molecule that enters the Kreb’s cycle.

(ii) Two end products produced in a single cycle of Kreb’s cycle is two molecules of ‘carbon dioxide’ and three molecules of ‘NADH’.

(iii) At the end of one Kreb’s cycle, ‘one molecule’ of ATP is produced. However, NADH and FADH2 which are by products of this cycle produced more ATP molecules subsequently through oxidative phosphorylation.

(iv) The hydrogen carriers enter the electron transport chain where they create a proton gradient to drive the transport of hydrogen ions across the mitochondrial membrane and convert “ADP to ATP”.