Total Points 100 Points Received Grade Parent signature__ _____________ **For ALL grades with a C or less**

Science7: Cell Division and Cancer Exam

Name: Date: Period:

I. List the NAME next to its symbol, of the four nitrogen bases that make up the DNA molecule. (2 pts each)

1. A=

2. C=

3. G=

4. T=

List the three STAGES (IN ORDER) of the Cell cycle. (2 pts each)

5. The 1st stage-

6. The 2nd stage-

7. The 3rd stage-

Identify the four PHASES (IN ORDER) that take place during Mitosis. (2 pts each)

8.

9.

10.

11.

II. Completion

Fill in the line to complete each statement. (2 pts each)

12. Each identical strand of a chromosome is called a(n)

.

13. begins when mutations disrupt the normal cell cycle.

14. The longest stage of the cell cycle is .

15. The two sides of the DNA ladder are made up of the molecules of

deoxyribose (sugar) and .

III. Match each word with its definition

Write the letter of the correct answer on the line to the left. (2 pts each)

16. Cell Cycle A. Any damage that causes a change in the DNA.

17. Mutation B. A doubled rod of condensed chromatin that carries genetic information.

18. Chromtaid C. A disease in which cells grow and divide uncontrollably.

19. Interphase D. The stage in which the cell’s nucleus divides.

20. Cancer E. The regular sequence of growth and division that cells undergo.

21. Cytokinesis F. Each identical strand or thread of a chromosome.

22. Mitosis G. The cell makes a copy of DNA in its nucleus.

23. Replication H. The first stage of the cell cycle.

24. Tumor I. In this stage, the cytoplasm divides and two new cells are formed .

25. Chromosome J. A mass of abnormal cells.

IV. Multiple Choice

Write the letter of the correct answer on the line at the left. (2 pts each)

26. DNA replication occurs duringa. prophase b. cytokinesisc. metaphase d. interphase

27. The final stage of the cell cycle is calleda. interphase b. mitosisc. cytokinesis d. telophase

28. During DNA replication, adenine pairs only witha. thymine b. cytosinec. guanine d. adenine

29. The cell grows to its mature size duringa. mitosis b. prophasec. telophase d. interphase

30. Most cases of cancer are caused bya. mutations b. radiationc. tumors d. drugs

31. Spindle fibers disappear in a. anaphase b. prophasec. telophase d. metaphase

32. Chromosomes line up in the center of the cell duringa. metaphase b. interphasec. prophase d. anaphase

33. Brain cells always stay in a. metaphase b. interphasec. prophase d. anaphase

34. The structure of DNA came froma. Frederick Griffin and Marice Wilkinsb. Rosalind Franklin and James Watsonc. James Watson and Francis Crickd. Marice Wilkins and Rosalind Franklin

35. The DNA molecule is often calleda. a “double helix” b. a “single helix”c. a “triple helix” d. a ladder

V. True or False

Write down true if the statement is true, and false if the statement is false.(1 pt each)

36. During the cytokinesis stage of the cell cycle, the cell’s nucleus divides into two new nuclei.

37. During interphase chromosomes are copied to make new daughter chromosomes.

38. Cancer begins when a mutation disrupts the cell cycle.

39. DNA replication begins when the two sides of the molecule unwind and separate.

40. In telophase the chromatids separate and begin to move to oppositeends of the cell.

VI. Using Science Skills

#41- 43. Label the parts of the structure in the diagram below. (1 pt each)

41. 41.

42. 43. 42.

43.

Use the figures below to answer questions to 44 and 45. Write your answer in the spaces provided.

44. Identify the phase of mitosis shown in each of the numbered 1 to 3. (1 pt each)

45. Continue the series of drawings by drawing a diagram to show what happens in the next phase of mitosis. LABEL your drawing with the name of the phase it represents. (4pts)

46. Using the diagram below write the symbols of nitrogen bases and “backbone” to complete the DNA strand. (5 pts)