In the 'S' phase of the cell cycle:

1. amount of DNA doubles in each cell.

2. amount of DNA remains the same in each cell

3. chromosome number is increased

4. amount of DNA is reduced to half in each cell.

The enzyme recombinase is required at which stage of meiosis:
1. Pachytene
2. Zygotene
3. Diplotene
4. Diakinesis

The complex formed by a pair of synapsed homologous chromosomes is called:

1. Kinetochore

2. Bivalent

3. Axoneme

4. Equatorial plate

During gamete formation, the enzyme recombinase participates during:
1. Metaphase-I
2. Anaphase-II
3. Prophase-I
4. Prophase-II

During mitosis ER and nucleolus begin to disappear at:

1. late prophase

2. early metaphase

3. late metaphase

4. early prophase

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

Given below is a schematic break-up of the phases/stages of cell cycle-
   
Which one of the following is the correct indication of the stage/phase in the cell cycle?

Synapsis occurs between:

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