Enzymes: practice question

A Biochemistry question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

Try it

Biochemistry · Enzymes

Sample item

Which enzyme class transfers phosphate groups from ATP to a substrate?

APhosphataseBProteaseCKinaseDIsomerase

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

C. Kinase

Kinases transfer phosphate groups, often from ATP, to target molecules, whereas phosphatases remove phosphate groups by hydrolysis.

Option by option

A. Phosphatase
Phosphatases remove phosphate groups.
B. Protease
Proteases cleave peptide bonds.
C. Kinase (correct)
Correct: kinases catalyse phosphorylation.
D. Isomerase
Isomerases rearrange molecular structure.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

Questions about this Biochemistry question

What is the answer to this Biochemistry question?

The best answer is C, Kinase. Kinases transfer phosphate groups, often from ATP, to target molecules, whereas phosphatases remove phosphate groups by hydrolysis.

Why is "Phosphatase" not the answer?

Phosphatases remove phosphate groups.

Why is "Protease" not the answer?

Proteases cleave peptide bonds.

Why is "Isomerase" not the answer?

Isomerases rearrange molecular structure.

What concept does this question test?

It tests Enzymes in Biochemistry. The correct option holds because: Correct: kinases catalyse phosphorylation.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Enzymes?

Build one table of enzyme deficiency, disease, inheritance and key finding, then revise it by spaced recall. Then use the flashcards and the other Biochemistry questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.