Exam 12: The Cell Cycle

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?

Several organisms, primarily protists, have what are called intermediate mitotic organization. What is the most probable hypothesis about these intermediate forms of cell division?

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

The decline of MPF activity at the end of mitosis is due to

Use the figure to answer the question below. 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 for one daughter nucleus at telophase of mitosis?

Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol prevents microtubule depolymerization. Thus, Taxol stops mitosis by interfering with which of the following structures or processes?

Which of the following molecules is a protein synthesized at specific times during the cell cycle that associates with a kinase to form a catalytically active complex?

A cleavage furrow is ________.

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

Once a cell enters mitosis, the molecules that activate division must be turned off. What happens to MPF during mitosis?

Which of the following molecules is released by platelets in the vicinity of an injury?

G₁ is associated with which of the following cellular events?

Cell A has half as much DNA as cells B, C, and D in a mitotically active tissue. Cell A is most likely in

At what stage of the cell cycle is the cyclin component of MPF destroyed?

FtsZ is a bacterial cytoskeletal protein that forms a contractile ring involved in binary fission. Its function is analogous to ________.

Scientists isolate cells in various phases of the cell cycle. They isolate a group of cells that have 1 1/2 times more DNA than G₁ phase cells. What is the most likely part of the cell cycle from which these cells were isolated?

The drug cytochalasin B blocks the function of actin. Which of the following aspects of the animal cell cycle would be most disrupted by cytochalasin B?

Which of the following molecules is a protein maintained at steady levels throughout the cell cycle that requires cyclin to become catalytically active?

Motor proteins require which of the following structures or molecules to function in the movement of chromosomes toward the poles of the mitotic spindle?

In a diploid cell with 5 chromosome pairs (2n = 10), how many centromeres will be found in a nucleus at G2 of the cell division cycle?