Which of the following phases of the cell cycle is also known as the resting phase?

In which phase of the cell cycle does $DNA$ replication occur?

Chromatin fibres duplication,Genetic material-$4C$,Histone protein synthesis,Membranous organelle duplication,$DNA$ replication,centriole duplication. How many of the above features are associated with the synthesis $(S)$ phase of the cell cycle?

If a cell has twice as much $DNA$ as in a normal functional cell,it means that the cell . . . . . .

If the initial amount of $DNA$ in a cell is $2C$,in which phase of the cell cycle will its amount become $4C$?

Ribonuclease,a mitotic poison,inhibits the cell cycle at which stage?