Chpt 12

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1

Mitosis and cytoplasmic division function in a. asexual reproduction of single-celled eukaryotes b. growth, tissue repair, often asexual reproduction c. gamete formation in prokaryotes d. both a and b

D

2

Which of the following is NOT associated with meiosis? a. spore formation b. somatic cells c. sexual reproduction d. sperm and egg

B

3

A duplicated chromosome has _____chromatid(s). a. one b. two c. three d. four

B

4

DNA replication occurs a. between the gap phases of interphase. b. immediately before prophase of mitosis. c. during prophase of mitosis. d. during prophase of meiosis.

A

5

The basic unit that structurally organizes a eukaryotic chromosome is the a. higher order coiling b. nucleosome c. microfilaments d. bipolar mitotic spindle

B

6

Chromosomes are duplicated during what portion of the cell cycle? a. M b. G1 c. G2 d. S

D

7

A somatic cell having two of each type of chromosome has a(n) ___ chromosome number a. diploid b. haploid c. tetraploid d. abnormal

A

8

If a parent cell has 16 chromosomes, how many sister chromatids will be present after duplication of the chromosomes? a. 64 b. 32 c. 16 d. 8

B

9

The spindle apparatus is made of a. Golgi bodies. b. microtubules. c. endoplasmic reticulum. d. nucleoprotein.

B

10

The chromosomes are aligned at the spindle equator during a. anaphase. b. metaphase. c. interphase d. prophase.

B

11

In which of the stages below does each chromosome consist of two DNA molecules? I. metaphase II. Telophase III. prophase IV. Anaphase

a. III and IV b. I, III, and IV c. I and III d. I, II, and III

C

12

Which of the following is the proper sequence for mitosis? I. metaphase II. telophase III. prophase IV. Anaphase

a. I, III, IV, II b. I, II, III, IV c. III, I, IV, II d. IV, I, III, II

C

13

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

a. kinetochores b. Golgi-derived vesicles c. actin and myosin d. centrioles and centromeres d. cyclin-dependent kinases

B

14

This illustration shows a. cytoplasmic division in an animal cell. b. a contractile ring mechanism. C. how chromosomes are dragged to the poles. D. cytoplasmic division in an animal cell and a contractile ring mechanism.

D

15

Which of the following statements concerning cancer cells is most accurate? a. Oncogenes are part of the regulatory section of a chromosome. B. Tumor cells have lost their inhibition to stop dividing. c.Oncogenes help control runaway cell division. d. Benign tumors usually spread to other body parts.

B

16

Three of the four events listed below are related by a common phase of mitosis. Select the exception. a. chromosomes decondense b. spindle microtubules disappear c. nucleolus reappears d. chromosomes separate

D