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.

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Biochemistry · Enzymes

Sample item

What happens to Vmax in pure competitive inhibition?

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

The answer and the reasoning

C. It remains unchanged

Competitive inhibitors compete at the active site and can be overcome with more substrate, so maximal velocity remains unchanged while apparent Km increases.

Option by option

  • A. It decreases to zero

    Vmax does not fall to zero because enough substrate can overcome competition.

  • B. It always doubles

    Competitive inhibition does not inherently double Vmax.

  • C. It remains unchanged (correct)

    Correct: Vmax is unchanged in pure competitive inhibition.

  • D. It becomes equal to Km

    Vmax and Km are different kinetic parameters.

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.

More Biochemistry questions

Questions about this Biochemistry question

What is the answer to this Biochemistry question?

The best answer is C, It remains unchanged. Competitive inhibitors compete at the active site and can be overcome with more substrate, so maximal velocity remains unchanged while apparent Km increases.

Why is "It decreases to zero" not the answer?

Vmax does not fall to zero because enough substrate can overcome competition.

Why is "It always doubles" not the answer?

Competitive inhibition does not inherently double Vmax.

Why is "It becomes equal to Km" not the answer?

Vmax and Km are different kinetic parameters.

What concept does this question test?

It tests Enzymes in Biochemistry. The correct option holds because: Correct: Vmax is unchanged in pure competitive inhibition.

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.