In a diploid cell with 5 chromosome pairs (2n = 10), how many sister chromatids will be found in a nucleus at prophase of mitosis?

20

Movement of the chromosomes during anaphase would be most affected by a drug that prevents which of the following events in mitosis and cell division?

shortening of microtubules

Starting with a fertilized egg (zygote), a series of six cell divisions would produce an early embryo with how many cells?

64

In the figure, G1 is represented by which numbered part(s) of the cycle?

I and V

Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the cell plate. This cell is most likely ________.
Group of answer choices

a plant cell in the process of cytokinesis

The unlettered circle at the top of the figure shows a diploid nucleus with four chromosomes that have not yet replicated. There are two pairs of homologous chromosomes, one long and the other short. One haploid set is black, and the other is gray. The circles labeled A to E show various combinations of these chromosomes. What is the correct chromosomal condition at prometaphase of mitosis?

B

Which of the following events occurs during interphase of the cell cycle?
Group of answer choices

replication of the DNA

The data in the table were obtained from a study of the length of time spent in each phase of the cell cycle by cells of three eukaryotic organisms designated beta, delta, and gamma. What is the best explanation for the data associated with delta cells?

Delta cells are in the G0 phase.

What is the name of the microtubule-organizing center found in animal cells as an identifiable structure present during all phases of the cell cycle?

centrosome

Besides the ability of some cancer cells to over proliferate, which of the following situations might logically result in a tumor?

lack of appropriate cell death

For a chemotherapeutic drug to be useful for treating cancer cells, which of the following characteristics is most desirable?
Group of answer choices

It specifically inhibits rapidly dividing cells.

At which phase of the cell cycle do centrioles begin to move apart in animal cells?

prophase

The beginning of anaphase is indicated by which of the following processes?

Enzymatic cleavage of cohesin.

During which phase of mitosis do the chromatids become chromosomes?

anaphase

In the cells of many eukaryotic species, the nuclear envelope has to disappear to permit which of the following events in the cell cycle?

attachment of microtubules to kinetochores

Metaphase is characterized by ________.

alignment of chromosomes on the equator of the cell

How is plant cell cytokinesis different from animal cell cytokinesis?

Plant cells deposit vesicles containing cell wall building blocks on the metaphase plate; animal cells form a cleavage furrow.

G1 is associated with which of the following cellular events?

normal growth and cell function

If there are 40 centromeres in a cell at anaphase of mitosis, how many chromosomes will be found in each daughter cell following cytokinesis?

20

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?

G2

If a cell at metaphase of mitosis contains 20 sister chromatids, how many chromosomes will be present in a G1 cell?

10

Eukaryotic chromosomes are composed of which of the following macromolecules?

DNA and proteins

If the cell whose nuclear material is shown in the figure continues toward completion of mitosis, which of the following events would occur next?

formation of telophase nuclei

The M phase checkpoint ensures that all chromosomes are attached to the mitotic spindle. If this does not happen, cells would most likely be arrested in ________.

metaphase

The mitotic spindle plays a critical role in which of the following processes?

separation of sister chromatids

Cells from advanced malignant tumors often have very abnormal chromosomes and an abnormal number of chromosomes. What might explain the association between malignant tumors and chromosomal abnormalities?

Cell cycle checkpoints are not in place to stop cells with chromosome abnormalities.