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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
    $\text{DNA}.$
  • B
    Protein.
  • ✓
    $\text{DNA}$ and protein.
  • D
    $\text{RNA}.$
✓

Answer

Correct option: C.
$\text{DNA}$ and protein.
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 $(\text{DNA}).$
  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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