Cells in ${\mathrm{G}}_0$ phase:
1. terminate the cell cycle
2. exit the cell cycle
3. enter the cell cycle
4. suspend the cell cycle

The correct sequence of phases in cell cycle is:

1. ${\mathrm{G}}_1\to \mathrm{S}\to {\mathrm{G}}_2\to \mathrm{M}$

2. $\mathrm{M}\to {\mathrm{G}}_1\to {\mathrm{G}}_2\to \mathrm{S}$

3. ${\mathrm{G}}_1\to {\mathrm{G}}_2\to \mathrm{S}\to \mathrm{M}$

4. $\mathrm{S}\to {\mathrm{G}}_1\to {\mathrm{G}}_2\to \mathrm{M}$

Which one of the following precedes re-formation of the nuclear envelope during the M-phase of the cell cycle?
 

Phage genome site on bacterial chromosome resulted in which structure?

1. Nucleic acid

2. heterocyst

3. Prophase

4. None of these

The material, which arrests cell division, is obtained from:

Which stages of cell division do the following figures A and B represent respectively? 

Given below is the representation of a certain event at a particular stage of a type of cell division. Which is this stage? 

1. Prophase-I during meiosis

2. Prophase-II during meiosis

3. Prophase of mitosis

4. Both prophase and metaphase of mitosis

The microtubules from the opposite poles of the spindle attach to the pair of homologous chromosomes in