Identify the correct statements regarding G1 phase of the cell cycle:
I: | It is the post-mitotic gap phase |
II: | The cell is metabolically active and grows continuously |
III: | Cell replicates its DNA |
1. | Only II | 2. | I and II only |
3. | Only I | 4. | I, II and III |
What would be the DNA content and chromosome number in a cell at the end of S phase with 2C DNA content and 2N chromosome number in G1?
1. | 4C and 4N | 2. | 2C and 4N |
3. | 4C and 2N | 4. | 2C and 2N |
The cells in the quiescent stage [G0] phase of the cell cycle:
1. | exit from the S phase |
2. | continue the events of cell cycle and complete the division |
3. | are metabolically active |
4. | cannot ever proliferate |
Mitosis is also called ‘equational division’ because:
1. | the number of chromosomes in both daughter cells are the same |
2. | the sum of the number of chromosomes in two daughter cells is equal to the number of chromosomes in the parent cell |
3. | each progeny cell receives only one set of chromosomes from the parent cell |
4. | the number of chromosomes in the parent and the progeny cells is the same |
The phase of the cell cycle during which DNA replication takes place is:
1. | G1 phase | 2. | S phase |
3. | G2 phase | 4. | M phase |
The correct chronology of stages of karyokinesis in mitosis is:
1. Prophase – Anaphase – Metaphase – Telophase
2. Prophase – Metaphase – Anaphase – Telophase
3. Prophase – Metaphase – Telophase – Anaphase
4. Telophase – Anaphase – Metaphase – Prophase
The centrosome duplicates during:
1. | Early Prophase | 2. | Late Prophase |
3. | S phase | 4. | G2 phase |
Prophase of mitosis is not characterized by:
1. condensation of chromatin
2. migration of centrosomes to opposite poles
3. formation of mitotic apparatus
4. pairing of homologous chromosomes
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
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