Q165 / 200 · NEET 2007 · Zoology

The Okazaki fragments in DNA chain growth:

  • A
    polymerize in the 3 ' to $5^{\prime}$ direction and replication fork
  • B
    prove semi-conservative nature of DNA replication
  • Correct answer
    C
    polymerize in the $5^{\prime}$ to 3 ' direction and explain 3' to 5' DNA replication
  • D
    result in transcription.

Solution

Okazaki fragments in DNA are linked up by the enzyme DNA ligase after replacing the RNA primers with deoxyribonucleotides after replacing the $\mathrm{RNA}$ primers with deoxyribonucleotides solution of the Okazaki fragments in DNA chain growth. Replication occurs always in 5'-3' direction. However, Okazaki fragments are synthesized on 3'-5' DNA template, join to form lagging strand which grows in $3^{\prime}-5^{\prime}$ direction.

Hence, the correct answer is option: 'C'.

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