Question

1. the process of mitosis occurs in all organisms, though the process can be slightly different among different species. based on observations of this image, in what type of organism is mitosis occurring? a. bacteria c. plant b. mammal d. reptile 24. the section holding the sister chromatids together is called a(n): a. aster c. centriole b. centromere d. gene 25. the definition, \division of the cytoplasm,\ refers to which stage of the cell cycle? a. mitosis c. cytokinesis b. interphase d. g2 26. during which stage of mitosis would you technically have double the number of chromosomes? a. metaphase c. prophase b. anaphase d. telophase 27. during which stage(s) of the cell cycle would you be able to see the chromosomes? a. only in prophase c. interphase and prophase b. anaphase and telophase d. prophase, metaphase, anaphase and telophase 28. which stage of mitosis is shown here? a. anaphase c. metaphase b. prophase d. telophase

Explanation:

• Question 23: Plant cells have cell walls, which are visible in the image. Bacteria are prokaryotes and do not undergo mitosis in the same way as eukaryotes. Mammals and reptiles (animal cells) do not have cell walls.
• Question 24: The centromere is the region that holds sister chromatids together. An aster is part of the mitotic spindle in animal cells. A centriole is an organelle involved in spindle formation in animal cells. A gene is a segment of DNA.
• Question 25: Cytokinesis is the division of the cytoplasm. Mitosis is the division of the nucleus. Interphase is the phase of the cell cycle where the cell grows and replicates DNA. G2 is a sub - phase of interphase.
• Question 26: During anaphase, sister chromatids separate, effectively doubling the number of chromosomes (from a count based on chromatid pairs to individual chromosomes). In metaphase, chromosomes are aligned. In prophase, chromosomes condense. In telophase, the nuclear envelope reforms.
• Question 27: Chromosomes are visible when they condense. This occurs in prophase, metaphase, anaphase, and telophase. In interphase, chromosomes are in a less condensed form (chromatin) and not visible as distinct chromosomes.
• Question 28: In prophase, the chromatin condenses into chromosomes, the nuclear envelope starts to break down, and the mitotic spindle begins to form. Anaphase is when chromosomes separate. Metaphase is when chromosomes align. Telophase is when the nuclear envelope reforms.

Answer:

1. C. plant
2. B. centromere
3. C. cytokinesis
4. B. anaphase
5. D. prophase, metaphase, anaphase and telophase
6. B. prophase