Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 15 PCB Single Correct MCQ
Published on: August 11, 2026

Which of the following is correct about genes?

A
The DNA sequence that codes for tRNA or rRNA is a cistron.
B
A segment of DNA that code for proteins is called cistron.
C
Only the segments that code for proteins are called genes.
D
Repetitive DNA normally code for protein (not all-the-time - constitutively).

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The correct answer is:
B

Though there is no ambiguity that the genes are located on the DNA, it is difficult to literally define a gene in terms of DNA sequence. The DNA sequence coding for tRNA or rRNA molecule also define a gene. However by defining a cistron as a segment of DNA coding for a polypeptide. The repetitive DNA sequences normally do not code for any proteins, but they form a large portion of human genome.

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