Biology (Holt)

Test

The illustration below shows the events of
the cell cycle. Use the illustration and your
knowledge of science to answer questions 1–3.

1.For about what proportion of the cell cycle

is the cell in interphase? 4B 6E

A less than 1/2 C more than 3/4

B less than 3/4 D more than 9/10

2.List the phases of the cell cycle starting

immediately after cell division. 4B 6E

F G 1 , S, G 2 , mitosis, cytokinesis

Gcytokinesis, G 1 , S, G 2 , mitosis

HS, G 2 , mitosis, cytokinesis, G 1

J G 1 , cytokinesis, mitosis, G 2 , S

3.If the phase during which DNA is synthe-

sized did notoccur, what effect would it

have on the cell cycle? 4B 6E

A Mitosis would immediately follow S.

B Cytokinesis would immediately follow G 2.

CG 1 would immediately follow mitosis.

DG 2 would immediately follow G 1.

CHAPTER 6Review 135

Critical Thinking

16. Predicting OutcomesPredict the result
    if cytokinesis were omitted from the cell
    cycle?


17. Inferring RelationshipsExplain the
    relationships between mitosis in
    eukaryotic cells and binary fission
    in prokaryotes.


18. Evaluating ConclusionsDamage to the
    brain or the spinal cord is usually perma-
    nent. Use your knowledge of the cell cycle
    to explain why damaged cells in the brain
    or spinal cord are not replaced.


19. Evaluating ViewpointsA newspaper article
    describes the concern that more infants
    with Down syndrome will be born in the
    United States as more women delay having
    children. Do you agree or disagree with
    this concern? Explain.

Alternative Assessment

20. Finding and Communicating Information
    Scientists have determined that telomeres
    (the tips of chromosomes) are shaved down
    slightly every time a cell divides. When the
    telomeres reach a certain length, the cell
    may lose its ability to divide. Find out what
    scientists have recently uncovered about
    telomeres and their association with cell
    division and cancer. Prepare a brief written
    report to share with your class.


21. Career ConnectionOncologistResearch
    the field of oncology, and write a report
    that includes a job description, training
    required, kinds of employers, growth
    prospects, and starting salary.


22. Interactive Tutor Unit 4Cell Reproduction
    Write a report summarizing how different
    cancer-fighting drugs kill cancer cells by
    interrupting the cell cycle. How is cell divi-
    sion related to cancer?

TAKS Test PrepTAKS Test Prep

G 1

G 2

Mitosis

Cytokinesis

S

INTER

PHA

SE

When several questions refer to the same graph,

table, drawing, or passage, answer the questions

you are sure of first.

4B 6E

4A 4B 6E

4B 6E

2B 2D 4B 6E

2B 3D

2B 4B 6E

4B 6C