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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance1 Mark
Question
For question, two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
  1. Both assertion and reason are true, and reason is the correct explanation of assertion.
  2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
  3. Assertion is true, but reason is false.
  4. Both assertion and reason are false.
Assertion: Adenine and guanine are double - ring bases.
Reason: Adenine and guanine are pyrimidines.
✓

Answer

  1. Assertion is true, but reason is false.

Explanation:

The bases of nucleic acids are of two types, (i) pyrimidines and (ii) purines. Adenine and guanine are double-ring bases called purines cytosine, thymine and uracil are single - ring bases called pyrimidines

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