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प्रश्न
Describe the events taking place during interphase.
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उत्तर
Even though it is referred to be the resting phase, the interphase is highly metabolically active. It is the period of time when the cell gets ready to divide by going through a systematic process of both cell growth and DNA replication.
G1 (Gap 1) phase
S (Synthesis) phase
G2 (Gap 2) phase
The G1 phase refers to the period between the mitosis of the preceding cell cycle and the commencement of DNA replication. In the G1 phase, the cell is metabolically active and undergoes continuous growth without DNA replication. The synthesis phase, or S phase, denotes the time frame in which DNA replication or synthesis occurs. DNA doubles in each cell throughout this period. In animal cells, centrioles duplicate in the cytoplasm while DNA replication takes place in the nucleus during the S phase. DNA synthesis ceases during the G2 phase, but protein and RNA synthesis continues as the cell grows in preparation for mitosis.
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संबंधित प्रश्न
What is the average cell cycle span for a mammalian cell?
Distinguish cytokinesis from karyokinesis.
What is G0 (quiescent phase) of cell cycle?
Most cytogenic activities occur during
Name the stage of mitosis in which chromosomes are arranged on the equator of spindle:
Match List - I with List - II.
| List I | List II | ||
| (a) | S phase | (i) | Proteins are synthesized |
| (b) | G2 phase | (ii) | Inactive phase |
| (c) | Quiescent stage | (iii) | Interval between mitosis and initiation of DNA replication |
| (d) | G1 phase | (iv) | DNA replication |
Choose the correct answer from the options given below.
The centriole undergoes duplication during ______
Mitosis is characterised by ______.
Cells which are not dividing are likely to be at ______.
Between a prokaryote and a eukaryote, which cell has a shorter cell division time?
Label the diagram and also determine the stage at which this structure is visible.
While examining the mitotic stage in a tissue, one finds some cells with 16 chromosomes and some with 32 chromosomes. What possible reasons could you assign to this difference in chromosome number. Do you think cells with 16 chromosomes could have arisen from cells with 32 chromosomes or vice versa?
Two key events take place, during S phase in animal cells, DNA replication and duplication of centriole. In which parts of the cell do events occur?
Name the phase of the cell cycle at which the following event occurs:
Chromosomes are moved to spindle equator.
Name the phase of the cell cycle at which the following event occurs:
Centromere splits and chromatids separate.
