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STD 12 - 5. molecular basis of inheritance — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 5. molecular basis of inheritance1 Mark
MCQ
Assertion : Histones are basic proteins of major importance in packaging of eukaryotic $DNA$. $DNA$ and histones comprise chromatin forming the bulk of eukaryotic chromosome.

Reason : Histones are of five major types $H_1,\,H_2A\,, H_2B,H_3$ and $H_4$ .

  • ✓
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: A.
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
a
Histones are basic proteins found in the eukaryotic chromosomes. These are rich in the amino acids lysine and arginine. Histonie proteins are basic proteins consisting of $5$ types $-H_1,\,H_2A,\,H_2B,\,H_3,\,H_4$.  $DNA$ is coiled around it. It exists as octamers linked with $H_1$.

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