Question

Mannose, galactose, and fructose all enter glycolysis at either the first or third pathway step. Which of the following accurately states the advantage of this design?

a. This prevents the buildup of lactate.
b. This allows the metabolism of these sugars to be regulated.
c. This allows for the sugars to be converted into glucose.
d. This allows for more ATP to be made per sugar.

Answer 1

Mannose, galactose, and fructose entering glycolysis at either the first or third pathway step allows for the metabolism of these sugars to be regulated.

Step-by-step explanation:

The advantage of mannose, galactose, and fructose entering glycolysis at either the first or third pathway step is that it allows for the metabolism of these sugars to be regulated. In glycolysis, the rate-limiting enzyme phosphofructokinase is active when the concentration of ADP is high and less active when ATP levels are high. This means that when there is sufficient ATP in the system, the glycolysis pathway slows down, preventing the overconsumption of energy resources.