DNA nitrogenous bases MCQ — 1 Practice Questions with Answers

DNA nitrogenous bases is a Science & Technology topic in the RAS/RPSC syllabus. This page gathers exam-style DNA nitrogenous bases multiple-choice questions with correct answers and explanations, so aspirants can test recall and revise frequently examined concepts.

Practice 1 DNA nitrogenous bases multiple-choice questions with detailed answers and explanations. Ideal for RAS/RPSC exam preparation.

1 Questions Science & Technology

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Q1. Which of the following nitrogenous bases is not a component of DNA?

A Uracil Correct

B Cytosine

C Adenine

D Guanine

Explanation

DNA contains four nitrogenous bases: adenine, guanine, cytosine and thymine. Uracil is not present in DNA; it is found in RNA, where it generally pairs with adenine. Cytosine is a pyrimidine base present in DNA and pairs with guanine. Adenine is a purine base present in DNA and pairs with thymine. Guanine is also a purine base present in DNA and pairs with cytosine. Therefore, uracil is the nitrogenous base that is not a component of DNA.

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