Many cells function properly and divide mitotically even though they do not have 

(1) Plasma membrane

(2) Cytoskeleton

(3) Mitochondria

(4) Plastids

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.
(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