A partly enclosed body of water where fresh water from a river or rivers mixes with seawater is referred to as a(n)
____.
a. upper littoral
b. midlittoral
c. lower littoral
d. estuary
e. upwellings
ANSWER: d
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Which trophic level forms the base of a food chain?
A. Tertiary consumers B. Secondary consumers C. Primary producers D. Quaternary consumers E. Primary consumers
Allosteric inhibition generally results from ____
a. excess substrates b. binding of regulatory molecules at sites other than the active sites c. a change in the temperature of the system d. a lack of coenzymes e. changes in pH
Which statement is true for scyphozoan medusae?
a. They are the dominant body form. b. They are generally smaller than hydrozoan medusae. c. Most live in freshwater. d. They are scavengers.
If a pregnancy has a 1/4 chance of producing a child with a genetic disorder, what are the odds that the next child will
also be born with the same disorder? a. 1/4 b. 1/8 c. 1/12 d. 1/16 e. 1/1