As men age, the prostate may enlarge but not become cancerous. This enlarged prostate may result in ________
A) sterility
B) difficulty with urination
C) impotence
D) constipation
B
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In the tropics, warm but nutrient-poor water above continental shelves is often occupied by ____
a. coral reefs b. kelp forests c. rocky shores d. salt marshes e. phytoplankton blooms
Some bacteria avoid being phagocytized by a host's immune system by means of:
a. ameboid motion. b. their capsule or slime layer. c. efficient use of their flagella. d. changing their cell wall structure. e. eliminating the use of a membrane
What is the average length of M phase?
a) about a day b) 4 hours and 35 minutes c) about 10 minutes d) about 10 hours e) about 1 hour
Viruses may cause cancer in these three typical ways:
A. All viruses promote host cell proliferation, as a way to spread more virus. B. Some viruses encode an oncogene in their genome. C. When a DNA virus brings extra DNA into the host cell, that signals that S phase is complete. D. Some viral proteins interact with cell cycle regulatory proteins. E. Viral infection provides large amounts of nutrients, encouraging the cell to divide and proliferate. F. Cell proliferation is an adaptive response of the host to any viral infection, to outgrow the virus. G. A viral genome may integrate into the host chromosome, disrupting a cell cycle gene.