A proto-oncogene ____
a. always becomes cancerous
b. causes cancer
c. encodes tumor-suppressing proteins
d. repairs DNA
e. regulates cell division
e
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Declining amphibian populations are correlated with
a. habitat loss. b. introduction of new species. c. long-term changes in climate. d. fungal infections and parasitic diseases. e. all of these.
The average life expectancy for males in the United States is
a. 80 years. b. 79 years. c. 76 years. d. 74 years. e. 65 years.
Ti plasmids and the T-DNA system can be used to transform any vascular plant
Indicate whether the statement is true or false
Some antibiotics used to treat bacterial infections kill the bacteria by chemically punching holes in the cell wall of the bacteria, by preventing the bacteria from replicating their DNA, or by many other actions that ultimately cause cell death. Why do these antibiotics not work to kill viruses and cure people of viral infections?
a. Antibiotics cannot kill a virus because viruses are not living cells with cell walls to puncture, nor do they have their own organelles to replicate DNA. b. Viruses are just too virulent to be killed by those antibiotics. c. Viruses are too quick for the antibiotics to work. d. Viruses mutate at a rate faster than the rate at which antibiotics can work to kill them.