Question: Kinases are enzymes that transfer a phosphoryl group from a nucleoside triphosphate. Which of the following are valid kinase-catalyzedreactions?
(a)
(b)

Kinase-catalyzed reactions are chemical processes that are catalyzed by kinases. This process involves these enzymes transferring one phosphoryl group from a nucleoside triphosphate to organic molecules. By phosphorylating other proteins, the kinase enzymes change their structure. Adenosine triphosphate (ATP) is the main source of phosphoryl groups (ATP).

"$ADP+CMP\to AMP+CDP$" is a kinase-catalyzed reaction that isn't genuine. The phosphoryl group is transferred from ADP rather than ATP in this process.

Thus, Option (a) is incorrect.

The enzyme adenylate kinase catalyzes the production of ADP from ATP. In this reaction, one phosphate group from ATP is transferred to AMP to generate two molecules of adenosine diphosphate (ADP).

$AMP+ATP\to 2ADP$

Thus, Option (b) is correct.

Thus, in the second reaction, the phosphorylation of ATP to ADP occurs. $AMP+ATP\to 2ADP$ is a valid kinase-catalyzed reaction.