Interferons
a. make holes through bacterial cell membranes.
b. make holes through bacterial cell walls.
c. prevent entry of viruses into cells.
d. block the replication of viruses within cells.
e. bind iron and make it unavailable for bacteria and viruses.
D
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One of the advantages seeds have over spores is that they can delay germination until conditions are favorable for growth
A. true B. false
The most diverse animal group is the:
a. mollusks b. arthropods c. nematodes d. chordates e. cnidarians
In seed plants, __________ allow reproduction
without standing water. Fill in the blank(s) with the appropriate word(s).
Genetic diagnosis by DNA testing
a. detects only mutant and not normal alleles. b. can be done only on eggs or sperm. c. involves hybridization to rRNA. d. often uses restriction enzymes and a polymorphic restriction site. e. cannot be done with PCR.