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 |
Statement I: | In male honeybees, haploid cells divide by mitosis. |
Statement II: | Higher plants show mitotic divisions only in diploid cells. |
1. | Statement I is correct and Statement II is incorrect. |
2. | Statement I is incorrect and Statement II is incorrect. |
3. | Statement I is correct and Statement II is correct. |
4. | Statement I is incorrect and Statement II is correct. |
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 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
I: | the segregation of duplicated chromosomes into daughter nuclei (karyokinesis) |
II: | division of the cell into two daughter cells by the separation of cytoplasm (cytokinesis) |
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
Cells at the end of prophase, when viewed under the microscope, show:
1. | Nuclear envelope | 2. | Nucleolus |
3. | Mitochondria | 4. | Endoplasmic reticulum |
The components of nuclear envelope are dismantled during:
1. | prophase and reconstructed during telophase |
2. | prophase and reconstructed during anaphase |
3. | metaphase and reconstructed during telophase |
4. | metaphase and reconstructed during anaphase |
1. | It follows the G2 phases of interphase. |
2. | It is marked by the initiation of condensation of chromosomal material. |
3. | The centrosome undergoes duplication during this phase in animal cells. |
4. | By the end of this phase, chromosomes are seen to be composed of two chromatids attached together at the centromere. |