Which of the Following Best Explains Why an Enzyme Hasn't $\Delta$

question 23

Multiple Choice

Which of the following best explains why an enzyme hasn't evolved to catalyze the following reaction as the first step of glycolysis?
glucose + P_i -> glucose-6-phosphate
I.The use of ATP is required for this step to serve as a regulatory control point.
II.The use of ATP is important because it helps keep its concentration low.Otherwise the high [ATP] would slow glycolysis too much through feedback inhibition.
III.The large positive $\Delta$ G˚' of this reaction would need to be overcome by an exceedingly high [P_i].
IV.Inorganic phosphate cannot be specifically placed on the carbon in the 6^th position.

• A)I, III
• B)I, II
• C)II, IV
• D)I only
• E)III only

Grasp the principles of phyletic gradualism and stabilizing selection.

Comprehend the factors that influence the likelihood of speciation occurring.

Understand mechanisms of reproductive isolation including sexual isolation and hybrid viability.

Distinguish between allopolyploidy and autopolyploidy and their roles in speciation.

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