JEE Main 2024ChemistryBiomoleculesMediumMCQ

JEE Main 2024 — Biomolecules Question with Solution

JEE Main 2024 (01 Feb Shift 1)

Question

If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:

Choose an option

Show full solutionCorrect option: B
Correct answer
BTACGAAGT

Step-by-step explanation

A DNA molecule consists of two long polynucleotide chains composed of four types of nucleotide subunits. Each of these chains is known as a DNA chain, or a DNA strand. Hydrogen bonds between the base portions of the nucleotides hold the two chains together.

Adenine base pairs with thymine with 2 hydrogen bonds and cytosine base pairs with guanine with 3 hydrogen bonds.

As we know that in DNA molecule , adenine (A) always pairs with thymine (T) and cytosine (C) always pairs with guanine (G).

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About this question

This is a previous-year question from JEE Main 2024, covering the Biomolecules chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.