When bound to ligand, this type of receptor changes conformation to allow ions to move down their concentration gradient across the membrane:
A. Channel-linked receptor
B. Enzymatic receptor
C. G protein-coupled receptor
D. Steroid hormone receptor
A. Channel-linked receptor
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Which one of the following statements about the human impact on Earth's ecology is correct?
A. Agriculture has increased abundance and distribution of some species, while decreasing abundance and distribution of other species. B. Humans commandeer as much as 25% of all photosynthetic production on land. C. More atmospheric nitrogen is converted to ammonia by humans than by the rest of nature. D. Human activities produce more carbon dioxide than do volcanoes. E. All of these statements about the human impact on Earth's ecology are correct.
The relationship between strands of RNA and DNA during transcription is
a. antagonistic. b. opposite. c. complementary. d. an exact duplicate. e. unrelated.
In the developing embryo, what precedes the formation of a long bone?
a. cartilage b. collagen c. periosteum d. osteons e. Haversian (central) canals
DNA Pol III catalyzes the addition of successive nucleotides to the 5' end of a growing polynucleotide
chain. __________________ Indicate whether the statement is true or false.