BIOS 1404 Chapter 9 The Cell Cycle

SUBSCRIBE

BIOS 1404 Chapter 9 The Cell Cycle

• Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early

embryo with how many cells?–Answer 32

• If there are 20 Chromatids in a cell, how many centromeres are there?

–Answer 20

• In eukaryotic cells, chromosomes are composed of DNA

–Answer and proteins

• What is produced if a cell divides by mitosis but does not undergo cytoki- nesis?

–Answer One cell with two nuclei, each identical to the nucleus of the parent cell.

• Humans produce skin cells by mitosis and gametes by meiosis. The nuclei of skin cells

produced by mit. will have –Answer Twice as much DNA as the nuclei of gametes produced by meiosis

• Compared to most prokaryotic cells, eukaryotic cells typically have

–Answer More DNA molecules and larger genomes

• At which phase are centrioles beginning to move apart in animal cells?

–Answer - Prophase

• If there are 20 centromeres in a cell at anaphase, how many chrom. are in each daughter cell

following cytokinesis?–Answer 1 / 2

SUBSCRIBE

10

• Where do the microtubules of the spindle originate during mitosis in animal cells?

–Answer Centrosome

• Taxol is anticancer drug...in animal cells, it disrupts microtubule formation by binding them

an accelerating assembly from Tubulin..stops mitosis affect- ing –Answer the formation of mitotic spindle

• Which of the following are primarily responsible for cytokinesis in plant cells but not in

animal cells?–Answer Golgi-derived vesicles

• Movement of the chromosomes during anaphase would be most affected by a drug that

prevents –Answer Shortening of microtubules

• Measurements of the amount of DNA per nucleus were taken on a large number of cells

from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus. In which stage of the cell cycle did the nucleus contain 6 picograms of DNA?–Answer G2

• A group of cells is assayed for DNA content immediately following mitosis and is found to

have an average of 8 picograms of DNA per nucleus. How many picograms would be found at the end of S and the end of G2?–Answer 16;16

• The beginning of anaphase in indicated by which of the following?

–Answer Cohe- sion is cleaved enzymatically.

• During which phase of mitosis do the chromatids become chromosomes?-
• / 2