Why are steroid hormones bound to carrier proteins in the blood?
a. to prevent them from entering non-target cells
b. to keep them in an inactivate state
c. to mask hydrophobic groups on the steroids to allow for circulation in the blood
d. to help them bind to surface receptors and trigger a cellular response
e. to help them bind to surface receptors and trigger endocytosis
ANSWER: c
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A strain that can grow in a minimal medium containing arginine, but NOT in minimal media containing citrulline nor in minimal media containing ornithine would have a mutation in the gene that encodes for _____.
Wild type bread mold can grow in a minimal medium without supplements, while certain mutated strains can only grow in a minimal medium that is supplemented with specific intermediates. See the figure below for an overview of the arginine biosynthetic pathway.
A. enzyme 1.
B. enzyme 2.
C. enzyme 3.
D. both enzymes 1 and 3.
E. both enzymes 2 and 3.
Extinction rates on islands are predicted, based on island biogeography, to be lowest
A. on small islands. B. on large islands. C. near islands. D. far islands.
A lake in which nutrients are low is
a. atrophic. b. oligotrophic. c. eutrophic. d. hypotrophic. e. hypertrophic.
These organisms live either attached to a substrate or free-living on the ocean floor.
A. benthic B. plankton C. pelagic D. littoral