Which of the following is not a characteristic of meiosis?

1.	It involves two stages of DNA replication one before meiosis-I and another before meiosis-II
2.	It involves recombination and crossing over
3.	Sister chromatids separate during anaphase- II
4.	Nuclear membrane disappears during prophase.

Microtubule depolymerizing drug such as colchicine is expected to 

Which of the following statements is incorrect about 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 

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

(1) transformation 

(2) translocation

(3) crossing over

(4) chromosomal aberration

Calcium dependent Kinases can control