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
1. | inhibit spindle formation during mitosis |
2. | inhibit cytokinesis |
3. | allow mitosis beyond metaphase |
4. | induce formation of multiple contractile |
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.
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. | 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. and
2. and
3. and
4. and
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