1. What is the name for the period of time when a cell is performing its usual f

Question

1. What is the name for the period of time when a cell is performing its usual functions and replicating DNA? 2. When does nuclear division occur? 3. Why do organisms perform mitosis? 4. List the four stages of the cell cycle. 15. What occurs during the S stage of interphase? 6. What is the term used to describe duplicated chromosomes? 7. If asters are observed in cells undergoing mitosis, are the cells animal or plant cells? 8. What structure, that helps chromosomes move, forms during prophase? 9. When do chromosomes align at the equator of the spindle'? 10. What happens to sister chromatids during anaphase of mitosis? 11. During which phase of mitosis does the nuclear envelope reform and the nucleolus reappear? 12. When are organelles divided up between daughter cells? ta. in sthich phase of thl l ell iand mont f her 14. What structure gives rise to new plant cell walls?

Explanation / Answer

1) Cell Cycle

2) Nuclear division occurs in mitosis

3) Organisms perform mitosis to reproduce Asexually and create identical copies of their DNA

4) Cell cycle has 4 phases -Two gap phases( G1 and G2), one S phase (Synthesis) and M phase (Mitosis)

5)During S phase of interphase chromosomes are replicated which forms sister chromatids.

6) Sister chromatids

7) Animal cells .Asters are star shapped structures formed during mitosis arround centrosome in animal cells

8) Mitotic spindles

9) Meta phase

10) During anapahse the sister chromatids are pulled away from the centrosome .

11) telophase

12)G2 phase of mitosis

13) interphase (G1-S- G2)

14) Shoot apical meristem

15) To provide equal no of chomosome copies for the newly formed daughter cells.

16) Sister chromatids maintain the integrity of the genome during mitosis.

17) actively diving cells are present in injury areas of skin ,scalp and injured body parts.

neurons ,muscle cells and cardiac myocytes do not divide further.

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