Exam 12: Mitosis

A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 10 picograms of DNA per nucleus. Approximately how many picograms of DNA would be found in a nucleus at prophase of mitosis?

Students in a biology lab isolated cells in various phases of the cell cycle. A population of cells that have twice the DNA of G1 phase cells was most likely isolated from which of the following part of the cell cycle?

In a diploid cell with four chromosome pairs (2n = 8), how many sister chromatids will be found in a nucleus at prophase of mitosis?

The unlettered circle at the top of the accompanying figure shows a diploid nucleus with four unreplicated chromosomes. The circles labeled 1 to 5 show various combinations of these chromosomes. Which chromosomal configuration would be observed at prometaphase of mitosis?

Cells from advanced malignant tumors often have very abnormal chromosomes and an abnormal number of chromosomes. Which of the following best explains the association between malignant tumors and chromosomal abnormalities?

Which of the following statements best describes what would happen if MPF (maturation-promoting factor) is introduced into immature frog oocytes that are arrested in G2?

Vinblastine is a standard chemotherapeutic drug used to treat cancer. Because it interferes with the assembly of microtubules, its effectiveness must be related to ________.

Which of the following statements best describes what happens to MPF during mitosis?

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 ________.

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 ________.

One difference between cancer cells and normal cells is that cancer cells ________.

Which of the following events characterizes the beginning of anaphase?

If a cell at metaphase of mitosis contains 32 sister chromatids, how many chromosomes will be present in a G1 cell?

Students in a biology lab isolated cells in various phases of the cell cycle. A population of cells that have 1 1/2 times the DNA of G1 phase cells was most likely isolated from which of the following parts of the cell cycle?

Beginning with a fertilized egg (zygote), how many cells will be present in the embryo following five rounds of cell division?

Amount of DNA per nucleus over the cell division cycle. Which region of the accompanying figure represents S phase?

Which of the following events occurs during interphase of the cell cycle?

Which of the following molecules is synthesized at specific times during the cell cycle and forms an active complex with a kinase?

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

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?