The structure that duplicates in the synthesis phase ($S$ phase) of cell division is/are:

Which of the following cells completes a cell cycle in $90$ minutes?

An egg cell has $10$ picogram of $\text{DNA}$ in its nucleus. How much amount of $\text{DNA}$ will be in this animal,at the end of $G_2$-phase of mitosis?

In which phase is the centrosome observed to be duplicated?

Which of the following statements is incorrect?

$DNA$ and histone proteins are synthesized during the following phase of the cell cycle: