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

            A                   B                   C

(1) Chromonema  Chromatin       Metaphase

(2) Chromatin      Chromatid       Metaphase

(3) Chromonema  Chromosome    Anaphase

(4) Chromonema  Chromatid       Anaphase.

Which is the longest phase of the cell cycle?
(1) M-phase

(2) Interphase

(3) Leptotene

(4) S-phase

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 

(1) repairing DNA damage

(2) apoptosis initiation

(3) assessing DNA damage

(4) none of these.

Identify the correct matched pair.
(1) Segregation-Metaphase ll

(2) Significance of meiosis-production of genetically similar cells

(3) Exchange of genetic material- DIakinesis

(4) Anaphase ll of meiosis-Centromeric division

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

(1) transformation 

(2) translocation

(3) crossing over

(4) chromosomal aberration

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

Calcium dependent Kinases can control 
(1) cell cycle activities

(2) DNA replication 

(3) Cell surface receptors

(4) membrane structure