On Pacific coasts, the population of mussels is kept in check by predation from:
a. sea otters.
b. sea stars.
c. sea urchins.
d. barnacles.
e. supralittoral isopods.
B
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Most monocots have numerous ____ roots arising from the stem
a. adventitious b. primary c. secondary d. taproot e. nonfibrous
In 1952, Hershey and Chase confirmed Avery's (1944) conclusion that
A. each DNA molecule is composed of two strands that are twisted into a double helix. B. proteins are the repositories for hereditary information. C. the replication of DNA is semiconservative. D. RNA is the repository for hereditary information. E. DNA is the repository for hereditary information.
The effect of beneficial microbes of normal biota against invading microbes is called ________.
A. axenic B. microbial antagonism C. infectious disease D. endogenous infection E. gnotobiotism
If a gene expresses itself, but not equally in all individuals that have it, there is a difference in
A. expressivity. B. penetrance. C. dominance. D. acquired traits.