General
✓✗Synapsis is accompanied by the formation of a complex structure called the
- aster
- cell plate
- kinetochore
- synaptonemal complex
General
✓✗Interkinesis differs from interphase in that
- DNA replicates twice in interkinesis
- it is longer than interphase
- chromosomes pair in interkinesis
- there is no replication of DNA during interkinesis
General
✓✗The most dramatic period of the cell cycle, involving a major reorganisation of virtually all components of the cell, is
- G1 phase
- M phase
- G2 phase
- S phase
General
✓✗Mitotic divisions in the lateral cambium of plants result in
- formation of gametes
- crossing over between chromosomes
- reduction of chromosome number
- continuous growth of the plant
General
✓✗At metaphase, chromosomes are attached to the spindle fibres by their
- centromeres
- secondary constrictions
- kinetochores
- satellites
General
✓✗Which one of the following is the quiescent stage of the cell cycle?
- G2
- M
- G1
- G0
General
✓✗In meiosis, the two successive divisions are
- both equational
- first reductional and second equational
- both reductional
- first equational and second reductional
General
✓✗In the oocytes of some vertebrates, which substage of prophase I can last for months or years?
- Diplotene
- Leptotene
- Diakinesis
- Pachytene
General
✓✗In telophase, the chromosomes
- condense to their maximum and align at the equator
- decondense and lose their individuality
- split at their centromeres and move to the poles
- pair with their homologues to form bivalents
General
✓✗The cell cycle of yeast is shorter than that of a human cell in culture. This shows that
- human cells have no M phase at all
- yeast cells do not replicate their DNA
- the duration of the cell cycle varies between organisms
- yeast cells have no interphase at all
General
✓✗By the end of prophase, which of the following is no longer seen in the cell?
- Centrosomes moving to opposite poles
- Nuclear envelope and nucleolus
- Spindle fibres of the mitotic apparatus
- Condensed chromosomes and centromeres
General
✓✗How many of the following occur during interphase?
Cell growth, DNA replication, centriole duplication, protein synthesis for mitosis, separation of sister chromatids
Cell growth, DNA replication, centriole duplication, protein synthesis for mitosis, separation of sister chromatids
- Two
- Four
- Five
- Three
General
✓✗The specialised kind of cell division that reduces the chromosome number by half and results in haploid daughter cells is
- mitosis
- amitosis
- cytokinesis
- meiosis
General
✓✗Match List-I with List-II.
Choose the correct answer from the options given below.
| List-I | List-II |
| P. S phase | (i) Proteins are synthesised |
| Q. G2 phase | (ii) Inactive phase |
| R. Quiescent stage | (iii) Interval between mitosis and initiation of DNA replication |
| S. G1 phase | (iv) DNA replication |
- P-(iii), Q-(ii), R-(i), S-(iv)
- P-(ii), Q-(iv), R-(iii), S-(i)
- P-(iv), Q-(i), R-(ii), S-(iii)
- P-(iv), Q-(ii), R-(iii), S-(i)
General
✓✗During pachytene, the bivalent chromosomes clearly appear as
- tetrads
- single chromatids
- dyads
- monads