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The Fundamental Unit of Life — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceThe Fundamental Unit of Life1 Mark
MCQ
Chromosomes are made up of:
  • A
    DNA.
  • B
    Protein.
  • C
    DNA and protein.
  • D
    RNA.
✓

Answer

  1. DNA and protein.

Explanation:

Chromosomes are thread-like structures usually present in the nucleus which becomes visible only during cell division. Each chromosome is made up of two components.

  1. Deoxyribonucleic acid (DNA).
  2. Proteins (e.g., histones and acidic proteins).

These consist of two (unreplicated) or four (duplicated) arms and a primary constriction or centromere which gives them a particular shape due to its position. The paired condition of chromosome is called diploid and unpaired chromosome are said to be haploid.

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