Which of the following statements is incorrect about G₀ phase.

1.	Mitosis occurs after G0 phase.
2.	Biocatalysts can be used to exit G0 phase.
3.	Cell volume keeps on increasing during this phase.
4.	Cell metabolism occurs continuously in G0 phase.

Beads on string like structures of A are seen in B, which further condense to form chromosomes in C stage of cell division.

Which is the longest phase of the cell cycle?

The checkpoint in cell cycle plays important role in 
(1) repair DNA damage
(2) apoptosis initiation 
(3) assess DNA damage
(4) inhibit cell damage.

The checkpoint in cell cycle plays important role in 

Identify the correct matched pair.

The mandatory combination responsible for assembly of microtubules are

1. $N{a}^{+}$ and $C{a}^{2+}$
2. $M{g}^{2+}$ and $C{a}^{2+}$
3. $C{l}^{-}$ and $C{a}^{2+}$
4. $N{a}^{+}$ and $K^{+}$

The exchange of segments of non-sister chromatids between chromosomes of a homologous pair termed as

Which of the following ions are necessary for assembly of microtubules?

(1) $N{a}^{+}$ and ${\mathrm{K}}^{+}$

(2) ${\mathrm{Ca}}^{2+}$ and ${\mathrm{Cl}}^{-}$

(3) ${\mathrm{Ca}}^{2+}$ and ${\mathrm{Mg}}^{2+}$

(4) ${\mathrm{Na}}^{+}$ and ${\mathrm{Ca}}^{2+}$

Which one of the following is the best stage to observe the shape, size and number of chromosomes in a cell?

(1) Interphase
(2) Prophase
(3) Metaphase
(4) Telophase