Question

name: tamaya crosby grade: cell cycle and mitosis knowledge check date: 4/14/15 period: 3rd instructions: read questions 1 - 6 carefully; then circle the correct response. 1. what is the primary function of the g1 phase of interphase in the cell cycle? a. dna replication b. cell growth and normal functions c. chromosome condensation d. cytokinesis for questions 7 - 9, indicate whether the statements are true or false. 7. mitosis is the longest event in the cell cycle. 2. during which phase of mitosis do the sister chromatids separate and move to opposite sides of the cell? a. prophase b. metaphase c. anaphase d. telophase 8. during metaphase, the sister chromatids align along the cells equator. 9. mitosis is essential for cell repair and growth. 3. what is the main purpose of cytokinesis in the cell cycle? a. replicating dna b. dividing the cytoplasm and organelles c. checking dna replication accuracy d. condensing chromosomes write your answers in the space provided for questions 10 - 11. 10. explain the significance of dna replication during the s phase of interphase. 4. which phase of mitosis involves the formation of spindle fibers and the breakdown of the nuclear envelope? a. prophase b. metaphase c. anaphase d. telophase 11. how does the cell - cycle regulation help prevent the accumulation of harmful mutations and ensure proper functioning of the cell? 5. when do the chromosomes start to decondense in mitosis and the nuclear envelope reforms? a. prophase b. metaphase c. anaphase d. telophase 12. identify the phases of mitosis. 6. if a sunflower cell with 34 chromosomes undergoes mitosis, how many chromosomes will each daughter cell have? a. 34 chromosomes b. 17 chromosomes c. 68 chromosomes d. 8 chromosomes

Explanation:

1. The G1 phase is for cell growth and normal functions before DNA replication.
2. In anaphase, sister chromatids separate and move to opposite poles.
3. Cytokinesis divides the cytoplasm and organelles to form two daughter - cells.
4. Prophase involves spindle fiber formation and nuclear envelope breakdown.
5. In telophase, chromosomes de - condense and the nuclear envelope reforms.
6. Mitosis results in daughter cells with the same number of chromosomes as the parent cell.
7. Mitosis is not the longest event; interphase is. So it's False.
8. During metaphase, sister chromatids align along the cell's equator. So it's True.
9. Mitosis is essential for cell repair and growth. So it's True.
10. DNA replication in the S - phase ensures each daughter cell gets a complete set of genetic material for proper cell function and inheritance.
11. Cell cycle regulation has checkpoints to monitor DNA integrity and cell processes, preventing mutations by halting the cycle if issues are detected.
12. The phases of mitosis are prophase (chromosomes condense, spindle forms, nuclear envelope breaks down), metaphase (chromosomes align at the equator), anaphase (sister chromatids separate), and telophase (chromosomes de - condense, nuclear envelope reforms).

Answer:

1. b. Cell growth and normal functions
2. c. Anaphase
3. b. Dividing the cytoplasm and organelles
4. a. Prophase
5. d. Telophase
6. a. 34 chromosomes
7. False
8. True
9. True
10. DNA replication in the S - phase ensures each daughter cell gets a complete set of genetic material for proper cell function and inheritance.
11. Cell cycle regulation has checkpoints to monitor DNA integrity and cell processes, preventing mutations by halting the cycle if issues are detected.
12. Prophase, Metaphase, Anaphase, Telophase