Which of the following is $NOT$ directly involved in the synthesis of a $DNA$ strand?

  • A
    Another $DNA$
  • B
    $t-RNA$ and $m-RNA$
  • C
    $r-RNA$
  • D
    Proteins

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$DNA$ replication in the lagging strand of most eukaryotic organisms is

The mode of $DNA$ replication is .....

Bacteria were grown in a medium containing a heavy isotope of nitrogen $(^{15}N)$ for many generations,and all their $DNA$ contained only heavy nitrogen. $A$ bacterium of this type was transferred to a normal medium and allowed to duplicate. After two divisions,the distribution of heavy $DNA$ is likely to be:

Which of the following diagrams correctly represents the process of $DNA$ replication at the replication fork?

Choose the correct option regarding the origin of replication $(ori)$.

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