Why has the immune system failed to evolve impenetrable protection against all pathogens?
a. Pathogens have population sizes that are much larger than those of their hosts.
b. Pathogens have much higher mutation rates than their hosts.
c. Pathogens and hosts are involved in an evolutionary arms race.
d. Pathogens and hosts are coevolving.
C
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The mutant BRCA1 gene imparts a dominantly inherited predisposition to breast cancer
a. True b. False Indicate whether the statement is true or false
A key feature of all viral infections is the
A. integration of viral DNA into host DNA. B. disintegration of host DNA. C. addition of a lipid membrane to the virus. D. separation of viral nucleic acid from the capsid.
Most plants and animals use __________ as their final
hydrogen acceptor in cellular respiration. a. oxygen b. sulfur c. nitrogen d. magnesium e. phosphorus
Which of the following is false concerning cardiac
muscle cells? They a. are striated. b. contain a single nucleus. c. have more mitochondria than do other types of muscle cells. d. have large stores of glycogen for energy. e. depend on aerobic respiration to supply their ATP.