Which of the following statements about gluconeogenesis in animal cells is true?
A) Ariseinthecellularleveloffructose-2,6-bisphosphatestimulatestherateofgluconeogenesis.
B) An animal fed a large excess of fat in the diet will convert any fat not needed for energy
production into glycogen to be stored for later use.
C) The conversion of fructose 1,6-bisphosphate to fructose 6-phosphate is not catalyzed by
phosphofructokinase-1, the enzyme involved in glycolysis.
D) Theconversionofglucose6-phosphatetoglucoseiscatalyzedbyhexokinase,thesameenzyme
involved in glycolysis.
E) The conversion of phosphoenol pyruvate to 2-phosphoglycerate occurs in two steps, including a
carboxylation.

C. THE CONVERSION OF FRUCTOSE 1,6-BISPHOSPHATE to fructose- 6- phosphate is not catalyzed by phosphofructokinase -1, the enzyme involved in glycolysis.

Explanation:

This statement is true as the enzyme involved in this step is FRUCTOSE-1,6-BISPHOSPHATASE.

Gluconeogenesis is the coversion of non-carbohydrate molecules (lactic acid, amino acids, glycerol) through the pyruvic acid into glucose in the cells.

This process takes place mainly in the liver and occurs during periods of fasting, starvation, low carbohydrate diets.

The pathway of gluconeogenesis involves eleven steps of enzymatic catalyzed reactions.

In the conversion of fructose 1,6- bisphosphate to fructose-6-phosphate is catalyzed by fructose 1,6-bisphosphatase and not by phosphofructokinase -1 which is involved in glycolysis. This step is a rate-limiting step of the pathway.

The conversion of glucose-6-phospahte to glucose is not catalyzes by hexokinase but glucose -6- phosphatase.

batolisis batolisis · Answer 2 · 2021-11-25T20:16:22+01:00

The true statement about gluconeogenesis in animal cells is : ( C ) The conversion of fructose 1,6-bisphosphate to fructose 6-phosphate is not catalyzed by phosphofructokinase-1, the enzyme involved in glycolysis.

During the conversion of fructose 1,6-bisphosphate to fructose 6-phosphate the process is not catalyzed by phosphofructokinase-1, but it is catalyzed by fructose 1,6-bisphosphatase.

Gluconeogenesis is the conversion of protein molecules like amino acid and lactic into glucose required in cells due to absence of carbohydrate molecules.

Gluconeogenesis occurs during ketosis because during the ketosis the amount of carbohydrate molecules present in consumed foods is very little.

Hence we can conclude that The conversion of fructose 1,6-bisphosphate to fructose 6-phosphate is not catalyzed by phosphofructokinase-1, the enzyme involved in glycolysis.

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