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

1. the section holding the sister chromatids together is called a(n):

a. aster
c. centriole
b. centromere
d. gene

1. the definition, \division of the cytoplasm,\ refers to which stage of the cell cycle?

a. mitosis
c. cytokinesis
b. interphase
d. g2

1. during which stage of mitosis would you technically have double the number of chromosomes?

a. metaphase
c. prophase
b. anaphase
d. telophase

1. 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

1. which stage of mitosis is shown here?

a. anaphase
c. metaphase
b. prophase
d. telophase

Explanation:

• Question 23: The image shows cells with cell walls, which are characteristic of plant cells. Bacteria are prokaryotes and do not undergo mitosis (they undergo binary fission). Mammals and reptiles are animals (no cell walls).
• Question 24: The centromere is the region that holds sister chromatids together. An aster is part of the spindle apparatus 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 cell growth and DNA replication. G2 is a sub - phase of interphase.
• Question 26: In anaphase, sister chromatids separate, and each chromatid becomes an individual chromosome. So, for a short time (until cytokinesis), the cell has double the number of chromosomes. In metaphase, chromosomes are lined up at the equator. In prophase, chromosomes condense but are still in the replicated form. In telophase, the cell is preparing for division, but the chromosome number per cell will return to the normal diploid number after cytokinesis.
• Question 27: Chromosomes are visible when they are condensed. During interphase, chromosomes are in a less - condensed form (chromatin). In prophase, metaphase, anaphase, and telophase, chromosomes are condensed and visible.
• Question 28: In prophase, the chromatin condenses into chromosomes, the nuclear envelope starts to break down, and the spindle apparatus begins to form. Anaphase shows sister chromatids being pulled apart. Metaphase has chromosomes lined up at the equator. Telophase has the formation of new nuclear envelopes.

Answer:

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