Cell walls of plants contain cellulose and __________, which aids in structural support
a. cutin
b. chitin
c. lignin
d. lipopolysaccharide
e. actin
C
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After three replications of a single DNA molecule, what percent of the resulting double helices contain
one strand of the "original" DNA? a. 0 percent b. 25 percent c. 50 percent d. 75 percent e. 100 percent
When the liver malfunctions and there is an abnormally large amount of bilirubin in the blood it can cause
A. the rolling stones. B. gallstones. C. cirrhosis of the liver. D. jaundice. E. kidney stones.
What happens when an action potential arrives at an axon terminal?
A. Membrane voltages stimulate the axon. B. Sodium ions are pumped out of the cell. C. A neurotransmitter builds up so it can be used again. D. The action potential causes an influx of phosphorous ions. E. Chemicals relay the message at a synapse.
A chemical agent that kills pathogenic microbes in general is a(n)
A. sanitizer. B. germicide. C. disinfectant. D. fungicide. E. antiseptic.