Pick the right answer: 1) Hexokinase: a. Promotes the retention of glucose in th
ID: 1036446 • Letter: P
Question
Pick the right answer:
1) Hexokinase:
a. Promotes the retention of glucose in the cell
b. Is irreversible
c. Undergoes a dramatic conformational change upon binding substrate
d. A and B
e. All of the above
2) Which product of triose phosphate isomerase is favored thermodynamically?
a. Triose 3 phosphate
b. Triose 1 phosphate
c. Dihydroxyacetone phosphate
d. Glyceraldehyde 3-phosphate
e. 3-phosphoglycerate
3) The formation of 1, 3-bisphosphoglycerate:
a. Involves the production of NADH
b. Produces CO2
c. Is highly energetic and irreversible
d. A and C
e. All of the above
4) The formation of phosphoenolpyruvate during glycolysis requires:
a. A dehydration reaction
b. The reduction of NADH
c. The cleavage of ATP
d. Substrate level phosphorylation
e. Phosphorylation of pyruvate
5) Lactate is:
a. Produced with the NADH formed during glycolysis
b. Generally metabolized in the liver
c. Able to block glycolysis if not removed from the muscle cell
d. A and C
e. All of the above
Explanation / Answer
1) Hexokinase is the enzyme used in the first step of glycolysis .
In this glucose gets phosphorylated at 6th position and therefore there occurs the retention of conformation . Also it is irreversible
Hence the ans. D
2)ans is D . In this Glyceraldehyde 3 phosphate is the favoured product.
3)ans is A . Formation of 1,3 bpg involves the formation of NADH .
4)water is removed during the formation of phosphoenolpyruvate pyruvate therefore option a.
5) lactate production leads to the production of NAD+ .
And it is metabolised in the muscles.
Ans should be C I.e it is able to block glycolysis if not removed from the muscle cell.