MB Quiz 3

Which of the following shows the greatest promise as a cancer chemotherapy agent?

a drug that prevents mitotic spindle from forming

In some organisms such as certain fungi and algae, cells undergo mitosis repeatedly without subsequently undergoing cytokinesis. What would be the consequence of this?

large cells containing many nuclei

Which of the following is probably the main factor responsible for the phenomenon of density-dependent inhibition? -physical contact of cell-surface proteins between adjacent cells -cells' innate ability to "sense" when the organ of which they are a part has no need for additional cells -a local deficiency of nutrients -a local accumulation of growth-inhibiting factors

physical contact of cell-surface proteins between adjacent cells

At the end of telophase I of meiosis, as cytokinesis occurs, there are __________.

two haploid cells

A cell is initially diploid, but it has a unique cell cycle in that this cell goes through two S phases instead of one. What would the remainder of its cell cycle consist of if this cell is to produce four identical diploid daughter cells at the end of its cell cycle?

two rounds of mitosis and two rounds of cytokinesis

A cell biologist carefully measured the quantity of DNA in grasshopper cells growing in cell culture. Cells examined during the G2 phase of the cell cycle contained 200 units of DNA. What would be the amount of DNA in one of the grasshopper daughter cells?

100 units

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?

16;16

When observing a chicken skin cell in G2 under a microscope, you count 156 total chromatids. How many chromosomes does a male chicken have in its sperm cells?

39

A human bone marrow cell in the prophase stage of mitosis contains 46 chromosomes. Therefore, there are a total of __________ sister chromatids in this cell.

92

Oncologists (medical doctors who treat cancer patients) routinely take biopsies (samples) of tissue from patients to determine whether the tissue is cancerous or not. What would be the best experiment to do to determine whether cells from the tissue sample are cancerous?

Add cells from the tissue sample to a cell culture dish and compare their growth against a sample of noncancerous cells from the patient.

How do cancer cells differ from normal cells?

Cancer cells are immortal.

Which of the following statements regarding sexual and asexual reproduction is true?

Sexual reproduction is more likely to increase genetic variation than is asexual reproduction.

Which of the following statements regarding mitosis and meiosis is true?

Sister chromatids separate during anaphase of mitosis and anaphase II of meiosis.

The M phase of mitosis and M phase of meiosis both occur after interphase. However, the two processes differ in the arrangement and behavior of their chromosomes. How?

The pairing up of homologous chromosomes and crossing over only occur during meiosis.

Which of the following is true of benign tumors, but not malignant tumors?

They remain confined to their original site.