11. In dividing animal cells, spindle fibers extend from a pair of microtubular structures called:

a) centromeres

b) centrioles

c) MTOCs

d) kinetochores

12. In which phase of mitosis do pairs of sister chromatids align in one plane at the center of the cell?

a) telophase

b) anaphase

c) metaphase

d) prophase

13. Which event occurs during the G2 stage of cell division?

a) DNA condenses and becomes visible as chromosomes

b) Cell growth occurs.

c) DNA replication occurs.

d) Centrosomes begin to move away from one another.

14. Which shows the correct order of phases of mitosis?

a) anaphase, prophase, telophase, metaphase

b) metaphase, prophase, anaphase, telophase

c) telophase, anaphase, prophase, metaphase

d) prophase, metaphase, anaphase, telophase

15. How is animal cell division different from plant cell division?

a) Plant cells lack centrioles.

b) Animals cells lack a cell plate.

c) Plant cells lack an aster.

d) All of the above.

16. In what phase of mitosis do sister chromatids become separate chromosomes?

a) prophase

b) anaphase

c) metaphase

d) telophase

17. Plants manufacture new sections of cell membrane and cell wall from vesicles derived from the:

a) Golgi complex

b) mitochondrion

c) endoplasmic reticulum

d) ribosome

18. Plant cells do not form a cleavage furrow because plant cells:

a) lack spindle fibers

b) have more chromosomes than animal cells

c) have a cell wall outside the cell membrane

d) All of the above

19. Division of the cell cytoplasm begins during what stage of cell division?

a) anaphase

b) telophase

c) G1

d) S

20. Chromosomes uncoil and nucleoli reappear in what stage of cell division?

a) prophase

b) metaphase

c) anaphase

d) telophase