Question

question 7
which of the following products of glycolysis initiates the citric acid cycle?
a. acetyl coa
b. oxalacetate
c. pyruvate
d. glucose
question 8
during the fermentation of one molecule of glucose, the net production of atp is ______ molecule(s).
a. three
b. one
c. six
d. two
question 9
which of the following processes occurs when o2 is unavailable to a cell?
a. pyruvate oxidation

Explanation:

For Question 7: Pyruvate from glycolysis is converted to Acetyl - CoA which initiates the citric - acid cycle.
For Question 8: During fermentation of one glucose molecule, the net ATP production is 2, as glycolysis produces 4 ATP but consumes 2 in the initial steps.
For Question 9: When O₂ is unavailable, fermentation occurs instead of pyruvate oxidation which requires oxygen.

Answer:

Question 7: A. Acetyl CoA
Question 8: D. two
Question 9: (Options are incomplete, but if fermentation was an option it would be correct. Assuming no other options are available, the question cannot be fully answered with given choices)