General
✓✗The first stage of karyokinesis of mitosis is
- prophase
- metaphase
- telophase
- anaphase
General
✓✗At the end of telophase and cytokinesis in mitosis, a diploid cell gives
- one tetraploid cell
- two diploid daughter cells
- two haploid daughter cells
- four haploid daughter cells
General
✓✗During anaphase, the centromeres of chromosomes move towards the poles and the arms of the chromosomes
- stay at the equator
- lead the movement
- trail behind
- fuse together
General
✓✗Some dividing cells exit the cell cycle and enter a vegetative inactive stage, called the quiescent stage (G0). This process occurs at the end of
- G2 phase
- S phase
- M phase
- G1 phase
General
✓✗Proteins needed for mitosis are synthesised mainly in
- telophase
- cytokinesis
- G0 stage
- G2 phase
General
✓✗During S phase, the chromosome number of a diploid cell
- becomes n
- remains 2n
- becomes 4n
- becomes 3n
General
✓✗Cytokinesis after telophase II results in the formation of a
- dyad of two diploid daughter cells
- syncytium with four nuclei in one cytoplasm
- tetrad of cells (four haploid daughter cells)
- single diploid cell with two nuclei
General
✓✗In a culture, a cell population has cells with 2C and 4C DNA. Cells with 4C DNA could be in
- G2 phase or early M phase
- G0 stage only
- G1 phase only
- telophase after cytokinesis only
General
✓✗Recombination nodules appear during
- zygotene
- pachytene
- diakinesis
- leptotene
General
✓✗The two chromatids of a chromosome separate at
- anaphase of mitosis
- telophase of mitosis
- metaphase of mitosis
- prophase of mitosis
General
✓✗Which of the following statements is incorrect?
- Plants show mitosis in both haploid and diploid cells.
- Mitosis occurs only in diploid cells in all organisms.
- In some social insects, haploid cells divide by mitosis.
- Mitosis is restricted to diploid somatic cells in animals.
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Cell growth in terms of cytoplasmic increase is a continuous process.
Reason (R): DNA synthesis occurs only during one specific stage of the cell cycle.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): Cell growth in terms of cytoplasmic increase is a continuous process.
Reason (R): DNA synthesis occurs only during one specific stage of the cell cycle.
In the light of the above statements, choose the correct answer from the options given below.
- (A) is true but (R) is false.
- (A) is false but (R) is true.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true but (R) is not the correct explanation of (A).
General
✓✗Which of the following statements about prophase I is incorrect?
- Synapsis is accompanied by the synaptonemal complex.
- Recombination nodules appear during zygotene.
- Recombination is completed by the end of pachytene.
- Diakinesis represents transition to metaphase.
General
✓✗A diploid organism has 2n = 20 chromosomes and 2C = 10 pg of DNA in G1. In G2, the chromosome number and DNA content per cell are
- 20 and 10 pg
- 20 and 20 pg
- 40 and 20 pg
- 10 and 5 pg
General
✓✗Which of the following statements about the cell cycle is incorrect?
- Centrioles duplicate during G1 phase in animal cells.
- DNA replication begins in the nucleus during S phase.
- Cells in G0 remain metabolically active.
- Proteins for mitosis are synthesised in G2 phase.