Question

1. what structure forms between dividing animal cells during cytokinesis?

a) cell plate b) cleavage furrow c) spindle fiber d) chromatid
part b: true or false (1 point each)
write t for true or f for false.

1. interphase is the longest phase of the cell cycle.
2. mitosis results in cells that are genetically identical.
3. cytokinesis and telophase happen at the same time.
4. chromosomes are only visible during interphase.
5. sister chromatids are separated during anaphase.
6. cells spend most of their life in interphase.
7. mitosis occurs only in prokaryotic cells.
8. each daughter cell has half the dna of the parent cell after mitosis.
9. spindle fibers attach to the centromere of chromosomes.
10. telophase is followed by cytokinesis.
11. plant cells form a cleavage furrow during cytokinesis.
12. dna replication occurs during the g2 phase.
13. the g1 checkpoint checks for cell size and growth.
14. cancer can result from mutations affecting the cell cycle.
15. mitosis produces genetically identical cells.

Explanation:

1. Interphase is indeed the longest phase of the cell cycle as it involves growth and DNA replication.
2. Mitosis results in two daughter cells that are genetically identical to the parent cell.
3. Cytokinesis (cell division) begins in telophase but is not exactly simultaneous in all aspects.
4. Chromosomes are visible during mitosis (prophase - telophase), not just interphase.
5. Sister chromatids are separated during anaphase of mitosis.
6. Cells spend most of their life in interphase (G1, S, G2).
7. Mitosis occurs in eukaryotic cells; prokaryotes have binary fission.
8. Each daughter cell has the same amount of DNA as the parent cell after mitosis.
9. Spindle fibers attach to the centromere of chromosomes to pull them apart.
10. Telophase is followed by cytokinesis to complete cell division.
11. Plant cells form a cell plate, not a cleavage furrow (which is in animal cells).
12. DNA replication occurs during the S phase, not G2.
13. The G1 checkpoint checks for cell size, nutrients, growth factors, and DNA damage.
14. Mutations affecting the cell cycle (e.g., in tumor - suppressor genes or proto - oncogenes) can lead to cancer.
15. Mitosis produces two genetically identical daughter cells.

Answer:

1. T
2. T
3. F
4. F
5. T
6. T
7. F
8. F
9. T
10. T
11. F
12. F
13. T
14. T
15. T