Molecular biology: 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 · Molecular biology

Sample item

During protein translation, what is a codon on messenger RNA?

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

The answer and the reasoning

D. Three-nucleotide mRNA sequence specifying an amino acid or stop

A codon is a three-base sequence in mRNA read by a tRNA anticodon during translation to specify an amino acid or termination.

Option by option

  • A. Lipid membrane channel

    Channels are membrane proteins.

  • B. DNA region that binds an enzyme only

    Enzyme-binding DNA sites are other regulatory elements.

  • C. Protein folding domain

    Protein domains are amino-acid structures.

  • D. Three-nucleotide mRNA sequence specifying an amino acid or stop (correct)

    Correct: triplet codons encode translation information.

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 D, Three-nucleotide mRNA sequence specifying an amino acid or stop. A codon is a three-base sequence in mRNA read by a tRNA anticodon during translation to specify an amino acid or termination.

Why is "Lipid membrane channel" not the answer?

Channels are membrane proteins.

Why is "DNA region that binds an enzyme only" not the answer?

Enzyme-binding DNA sites are other regulatory elements.

Why is "Protein folding domain" not the answer?

Protein domains are amino-acid structures.

What concept does this question test?

It tests Molecular biology in Biochemistry. The correct option holds because: Correct: triplet codons encode translation information.

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 Molecular biology?

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.