Bio 1404 Chapter 9: The Cell Cycle – Flashcards

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

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

In eukaryotic cells, chromosomes are composed of DNA

What is produced if a cell divides by mitosis but does not undergo cytokinesis?

Humans produce skin cells by mitosis and gametes by meiosis. The nuclei of skin cells produced by mit. will have

Compared to most prokaryotic cells, eukaryotic cells typically have

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

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

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

Taxol is anticancer drug...in animal cells, it disrupts microtubule formation by binding them an accelerating assembly from Tubulin..stops mitosis affecting

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

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

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?

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?

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

During which phase of mitosis do the chromatids become chromosomes?

What is a cleavage furrow?

Using which of the following techniques would enable your lab group to distinguish between a cell in G2 and a cell from the same organism in G1?

You have the technology necessary to measure each of the following in a sample of animal cells: chlorophylls, organelle density, picograms of DNA, cell wall components, and enzymatic activity. Which would you expect to increase significantly from M to G1?

A plant-derived protein known as colchicine can be used to poison cells by blocking the formation of the spindle. Which of the following would result if colchicine is added to a sample of cells in G2?

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

When a cell is in late anaphase of mitosis, which of the following will we see?

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

Which is the first checkpoint in the cell cycle where a cell will be caused to exit the cycle if this point is not passed?

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

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

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

Which of the following triggers the cell's passage past the G2 checkpoint into mitosis?

The cyclin component of MPF is destroyed toward the end of which phase?

Proteins that are involved in the regulation of the cell cycle, and that show fluctuations in concentration during the cell cycle, are called

The MPF protein complex turns itself off by

Density-dependent inhibition is explained by which of the following?

Which of the following is true concerning cancer cells?

Which of the following describes cyclin-dependent kinase (Cdk)?

Besides the ability of some cancer cells to overproliferate, what else could logically result in a tumor?

Why do neurons and some other specialized cells divide infrequently?

Which of the following most accurately describes a cyclin?

All cell cycle checkpoints are similar in which way?

At the M phase checkpoint, the complex allows for what to occur?

Anchorage dependence of animal cells in vitro or in vivo depends on which of the following?

Researchers began a study of a cultured cell line. Their preliminary observations showed them that the cell line did not exhibit either density-dependent inhibition or anchorage dependence. What could they conclude right away?

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

You have a series of cells, all of which were derived from tumors, and you first need to find out which ones are malignant. What could you do?

What is the correct chromosomal condition for one daughter nucleus at telophase of mitosis? (Fig 9.1)

If the cell whose nuclear material is shown in Figure 9.2 continues toward completion of mitosis, which of the following events would occur next?

In Figure 9.3, mitosis is represented by which numbered part(s) of the cycle?

G1 is represented by which numbered part(s) of the cycle? (Fig 9.3)

Which number represents DNA synthesis? (Fig 9.3)

Which number represents the point in the cell cycle during which the chromosomes are replicated? (Fig 9.3)

At which of the numbered regions would you expect to find cells at metaphase? (Fig 9.3)

MPF reaches its threshold concentration at the end of this stage.

A particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question is most likely in

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 does not occur during mitosis?

In the cells of some organisms, mitosis occurs without cytokinesis. This will result in

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

Several organisms, primarily protists, have what are called intermediate mitotic organization. These protists are intermediate in what sense?

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

(Data table 9.1) Of the following, the best conclusion concerning the difference between the S phases for beta and gamma is that

(Data table 9.1) The best conclusion concerning delta is that the cells