Q. No.The start of the second phase of mitosis, metaphase, is marked by:
1. complete disintegration of the nuclear envelope
2. alignment of chromosomes at the equatorial plate
3. de-condensation of chromatin
4. reappearance of the nucleolus
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Plants show mitotic divisions:
1. only in germ line cells
2. at the root apex and shoot apex only
3. in both diploid and haploid cells
4. for the productions of gametes only
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Consider the given two statements:
| I. | Morphology of chromosomes is best studied at metaphase |
| II. | At this stage, a chromosome is made up of two sister chromatids, held together at the centromere |
1. Both I and II are true and II explains I
2. Both I and II are true but II does not explain I
3. I is true but II is false
4. I is false but II is true
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If a cell had 4[2 pairs] chromosomes at G1 phase, what would be the number of chromosomes in this cell at the end of anaphase?
| 1. | 2 | 2. | 4 |
| 3. | 6 | 4. | 8 |
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The phase of the cell cycle that lasts for the least time is the:
| 1. | G1 phase | 2. | S phase |
| 3. | G2 phase | 4. | M phase |
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All the following key events take place during telophase of mitosis except:
1. Chromosomes cluster at the opposite spindle poles
2. Chromosomes become discrete
3. Nuclear envelope reforms
4. Nucleolus, ER and Golgi complex reform
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In a plant cell during the S phase of the cell cycle:
I. DNA replication begins in the nucleus
II. Centriole duplicates in the cytoplasm
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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Identify the incorrect statement regarding cytokinesis:
| 1. | Animal cells divide by cleavage furrow |
| 2. | Cell plate formation takes place during cytokinesis in plant cells |
| 3. | The cell wall formation in plant cells starts near the existing lateral walls and grows inwards |
| 4. | At cytokinesis, mitochondria and plastids are distributed between daughter cells |
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Liquid endosperm in coconut forms due to:
1. Failure of cytokinesis after karyokinesis
2. Failure of karyokinesis before cytokinesis
3. Disruption of spindle fibers at metaphase
4. Continued DNA replication during cytokinesis
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At the metaphase plate:
1. The sister chromatids of a chromosome are connected by their kinetochores to the spindle fibers from the same pole
2. The non sister chromatids of a chromosome are connected by their kinetochores to the spindle fibers from the same pole
3. The sister chromatids of a chromosome are connected by their kinetochores to the spindle fibers from the opposite poles
4. The non sister chromatids of a chromosome are connected by their kinetochores to the spindle fibers from the opposite poles
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