Question

In the context of phosphoryl group transfers and ATP synthesis, the textbook mentions two enzymes, PPK-1 and PPK-2, which essentially catalyze the same reaction but are utilized under different conditions. The explanation provided suggests that PPK-1 is employed when polyphosphate synthesis is thermodynamically favorable, while PPK-2 is utilized when the reverse reaction (ATP synthesis) is favorable. What can be inferred about the need for having two different enzymes?

A) The textbook is accurate, and the distinct enzymes are necessary for catalyzing the forward and reverse reactions separately.
B) Both enzymes are required to ensure specificity in their respective reactions, avoiding interference between polyphosphate synthesis and ATP synthesis.
C) The textbook is incorrect or poorly worded; all enzymes inherently catalyze both the forward and reverse reactions.
D) PPK-1 and PPK-2 function as coenzymes, enhancing the catalytic efficiency of each other in specific reaction conditions.
E) The need for two enzymes arises from distinct substrate preferences, allowing PPK-1 to selectively engage in polyphosphate synthesis and PPK-2 in ATP synthesis.

Answer 1

The need for two different enzymes arises from distinct substrate preferences, allowing PPK-1 to selectively engage in polyphosphate synthesis and PPK-2 in ATP synthesis.

Step-by-step explanation:

The need for two different enzymes, PPK-1 and PPK-2, in the context of phosphoryl group transfers and ATP synthesis can be inferred from the fact that these enzymes catalyze the same reaction but are utilized under different conditions.

PPK-1 is employed when polyphosphate synthesis is thermodynamically favorable, while PPK-2 is utilized when the reverse reaction (ATP synthesis) is favorable. This implies that the two enzymes have distinct substrate preferences, with PPK-1 selectively engaging in polyphosphate synthesis and PPK-2 in ATP synthesis.