Q33 / 160 · TS EAMCET 2021 (06 Aug Shift 2) · Chemistry

Assertion (A) Adenine and guanine are present in RNA as purine bases. Reason (R) The base uracil is present in RNA. The correct option among the following is

  • A
    $(A)$ is true, $(R)$ is true and $(R)$ is the correct explanation for $(A)$.
  • Correct answer
    B
    $(A)$ is true, $(R)$ is true but $(R)$ is not the correct explanation for $(A)$.
  • C
    $(A)$ is true but $(R)$ is false.
  • D
    (A) is false but (R) is true.

Solution

RNA contains four bases : The purines - adenine (A) and guanine $(G)$. The pyrimidines - cytosine (C) and uracil (U). The bases can interact via hydrogen bonds. So, (A) and (R) are true but (R) is not the correct explanation of (A).

Hence, the correct answer is option: 'B'.

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