Name 	   Class 	    Date 	

10.3 Regulating the Cell Cycle
Controls on Cell Division
For Questions 1–6, write True if the statement is true. If the statement is false, change the underlined word or words to make the statement true.
	   1.   Cells tend to continue dividing when they come into contact with other cells.
	   2.   Cell division speeds up when the healing process nears completion.
	   3.   Proteins called growth factors regulate the timing of the cell cycle in eukaryotic cells.
	   4.   If chromosomes have not attached to spindle fibers during metaphase, an internal regulatory protein will prevent the cell from entering anaphase.
	   5.   Growth factors are external regulatory proteins that slow down the cell cycle.
	   6.   Once apoptosis is triggered, a cell proceeds to self-destruct.

7. Complete the cause-and-effect chart by giving an example of an effect caused by each type of regulatory protein.

Factors Affecting the Cell Cycle	
Cause	Effect	
Cyclins		
Internal regulatory proteins		
External regulatory proteins		
Cancer: Uncontrolled Cell Growth
8. What is cancer?

9. What are the two basic types of tumors? Explain how they are different.

	

10. Why can cancer be life threatening?

	

11. What is the cause of cancer?
	
12. How do radiation and chemotherapy affect cancer cells?

13. Fill out the flowchart by completing each statement with the correct word or words.

Cancer cells do not respond to signals that regulate cell 	.

Cancer cells form a mass of cells called a 	.

Cancer cells may break loose and 	 throughout the body.

Cancer cells form tumors in other tissues by 	.

14. Hair grows from hair follicles, pockets of continually dividing cells in the outer layer of the skin. New cells are added to the base of a hair shaft, inside each follicle. Use what you have learned in this lesson to explain why cancer patients often lose their hair when receiving chemotherapy and grow more hair after chemotherapy stops.