In which phase of the cell cycle are chromosomes found as a diffused network of chromatin?

If a dividing cell is placed in a medium containing radioactive thymidine,the radioactivity will first be observed in:

What will be the content of $DNA$ in a somatic cell at $G_2$ phase if its meiotic products have $20 \; pg$ of $DNA$ (in $; pg$)?

If a cell is diploid $(2n)$ in the $G_1$ phase,then in the subsequent $S$ phase,the cell will remain/become ........

It is observed that heart cells do not exhibit cell division. Such cells do not divide further and exit $G_{1}$ phase to enter an inactive stage called $G_{0}$ of cell cycle. Fill in the blanks.

What change occurs in the nucleus of a cell as it progresses from the $G_1$ phase to the $G_2$ phase?