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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance1 Mark
MCQ
When DNA replication starts:
  • A
    The leading strand produces Okazaki fragments.
  • B
    The hydrogen bonds between the nucleotides of two strands break.
  • C
    The phosphodiester bonds between the adjacent nucleotides break.
  • D
    The bonds between the nitrogen base and deoxyribose sugar break.
✓

Answer

  1. The hydrogen bonds between the nucleotides of two strands break.

Explanation:

DNA replication starts with the unzipping of the DNA helixes which are held together by the hydrogen bonds.

Helicase enzyme is responsible for the breaking of hydrogen bonds between nucleotides of the DNA strand thus separating two strands of the DNA.

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