Ch.9: The Cell Cycle

Question 1

The complex of DNA and protein that makes up a eukaryotic chromosome is properly called __________.

Answer 1

chromatin

Question 2

During interphase, the genetic material of a typical eukaryotic cell is __________.

Answer 2

dispersed in the nucleus as long strands of chromatin

Question 3

Assume that you are dealing with a species in which the number of chromosomes in each somatic cell is 14. How many sister chromatids are present in the early telophase of mitosis?

Answer 3

0

Question 4

You would know a dividing cell was a plant cell rather than an animal cell if you saw that __________.

Answer 4

it had formed a cell plate

Question 5

A cell entering mitosis with 32 chromosomes will produce daughter cells with __________.

Answer 5

None of the listed responses is correct.

Question 6

Which of the following processes does not occur in dividing bacteria?

Answer 6

Mitosis

Question 7

What is the difference between a benign tumor and a malignant tumor?

Answer 7

Cells of benign tumors do not metastasize; those of malignant tumors do.

Question 8

When not engaged in the processes leading to cell division, how many chromosomes from your mother are present in the nucleus of each of your somatic cells?

Answer 8

23

Question 9

During binary fission of a bacterium, __________.

Answer 9

origins of replication move apart

Question 10

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 each contained 200 units of DNA. What would be the amount of DNA at G1 of the cell cycle in a daughter cell of one of these cells?

Answer 10

100 units

Question 11

Which of the following does not occur during mitosis?

Answer 11

Duplication of chromosomes

Question 12

Tissue culture experiments with PDGF demonstrate that without this substance __________.

Answer 12

fibroblasts fail to divide

Question 13

Which of the following represents a mismatch or incorrect description?

Answer 13

Metaphase: the nuclear envelope disappears

Question 14

A biochemist measured the amount of DNA in cells growing in the laboratory and found that the quantity of DNA in the cells doubled __________.

Answer 14

between the G1 and G2 phases

Question 15

Cytokinesis refers to __________.

Answer 15

division of the cytoplasm

Question 16

One event occurring during prophase is __________.

Answer 16

the beginning of the formation of a mitotic spindle

Question 17

Down syndrome is characterized by cells having three copies of chromosome 21. As a somatic cell in an individual with Down syndrome prepares to enter mitosis, how many chromatids would be present in the cell’s nucleus?

Answer 17

94

Question 18

The cleavage furrow forms during which stage of mitosis and cell division of an animal cell?

Answer 18

Cytokinesis

Question 19

If a human somatic cell is in metaphase, it has __________ chromatids.

Answer 19

92

Question 20

Sister chromatids are __________.

Answer 20

identical copies of a chromosome

Question 21

The person credited with the axiom, “Every cell from a cell” is __________.

Answer 21

Rudolf Virchow

Question 22

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

Answer 22

Nerve cell

Question 23

In a human skin cell that is going through the cell cycle, when do the centrosomes separate?

Answer 23

Prophase

Question 24

The function of mitosis and cytokinesis is to produce daughter cells that __________.

Answer 24

are genetically identical to the parent cell

Question 25

Observations of cancer cells in culture support the hypothesis that cancer cells __________.

Answer 25

do not exhibit density-dependent inhibition