MCQ
Select the correct statements regarding S-phase of interphase

$I.$ Occurs between $G_{1}$ and $G_{2}$

$II.$ $DNA$ replication begins in the nucleus

$III.$ Centrioles duplicate in the cytoplasm

$IV.$ As $DNA$ is doubled, number of chromosomes also doubles

The option with correct statements is

  • A
    $IV$ and $III$
  • B
    $I, II, III$ and $IV$
  • C
    $II, III$ and $IV$
  • $I, II$ and $III$

Answer

Correct option: D.
$I, II$ and $III$
d
S-phase is the sub-phase between $G_{1}$-phase and $G_{2}$-phase, during which $DNA$ synthesis or replication takes place.

In animal cells, during the S-phase, $DNA$ replication begins in the nucleus and the centriole duplication in the cytoplasm. The amount of $DNA$ per cell doubles in the nucleus. If the initial amount of $DNA$ is denoted as $2 C$, then it increases to $4 C$. However, there is no increase in the chromosome number

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