Ch. 8 questions

most cells will start cell division if they receive the proper signal at a checkpoint in the_____phase of the cell cycle

G1

which of the following is true of human somatic cells?

they are diploid

A culture of rat cells is treated with a chemical that interferes with the activity of microfilaments. Which of the following will probably be affected the most?

cytokinesis

which of the following does NOT lead to genetic variability?

division of chromosomes during anaphase of mitosis

meiosis

halves the number of chromosomes in cells

which of the following is the most significant difference between mitosis and meiosis?

homologous pairs of chromosomes are split up in meiosis

crossing over is

important in genetic recombination

In some organisms, such as certain fungi and algae, cells undergo the cell cycle repeatedly without subsequently undergoing cytokinesis. What would result from this?

large cells containing many nuclei

You would be unlikely to see which of the following human cells dividing?

muscle cell

which of the following is not a function of mitotic cell division in animals?

production of gametes

in telophase of mitosis, the mitosis spindle breaks down and nuclear membranes form. this is essentially the opposite of what happens in

prophase

A picture of a dividing northern bluebird cell taken through a microscope shows that the cell contains seven chromosomes, each consisting of 2 chromatids. this picture must have been taken during

prophase 2 of meiosis

which of the following carry the same genetic information

sister chromatids

human____are diploid, and human____are haploid

somatic cells, gametes

a zoologist examined a stomach cell from a lobster and counted 200 chromosomes, each consisting of 2 chromatids, at prophase 1 of meiosis. what would she expect to see in each of the four cells at telophase 2 of meiosis if she looked in the lobster's ovary?

100 chromosomes, each consisting of 1 chromatid

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 at G1 of the cell cycle in one of the grasshopper daughter cells?

100 units

If there are 22 chromosomes in the nucleus of a toad skin cell, a toad egg would contain __________ chromosomes.

11

what would be the quantity of DNA in one of the grasshopper cells produced by telophase 2 of meiosis?

50 units

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

sister chromatids of 2 homologous chromosomes

are also called homologous chromosomes