Quiz 14

In muscle cells, fermentation produces _____.

lactate and NAD+

In fermentation _____ is reduced and _____ is oxidized.

pyruvate … NADH The pyruvate from glycolysis is reduced to either lactate or ethanol, and NADH is oxidized to NAD+.

In the absence of oxygen, what is the net gain of ATP for each glucose molecule that enters glycolysis?

none, because in the absence of oxygen, no ATP can be made
none, because all of the available energy remains in either lactate or ethanol
two ATP
up to 30 ATP
four ATP

2 ATP Four ATP are made, but two ATP are consumed to start the process of glycolysis.

Which of the following statements accurately describes the function of a metabolic pathway involved in cellular respiration?

The function of glycolysis is to begin catabolism by breaking glucose into two molecules of pyruvate, with a net yield of two ATP.
The function of the bonding of acetic acid to the carrier molecule CoA to form acetyl CoA is the reduction of glucose to acetyl CoA.
The function of the citric acid cycle is the transfer of electrons from pyruvate to NADH to O2.

The function of glycolysis is to begin catabolism by breaking glucose into two molecules of pyruvate, with a net yield of two ATP. Glycolysis is the first stage in cellular respiration and does not depend on the presence of oxygen.

Identify all correct statements about the basic function of fermentation.
Select all that apply.

The basic function of fermentation is the regeneration of NAD+, which allows continued ATP production by glycolysis.
The basic function of fermentation is the production of additional ATP by further oxidation of the products of glycolysis.
The basic function of fermentation is the production of ethyl alcohol or lactic acid.

The basic function of fermentation is the regeneration of NAD+, which allows continued ATP production by glycolysis. Fermentation occurs in the absence of oxygen and does not yeild as much ATP. Read about fermentation.