The amino acid targets of protein kinases in all GPCR pathways are ____
a. serine and glycine
b. serine and tyrosine
c. serine and threonine
d. glycine and tyrosine
e. glycine and threonine
ANSWER: c
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Which of the following could be considered the most recent common ancestor of living tetrapods?
A) a sturdy-finned, shallow-water lobe-fin whose appendages had skeletal supports similar to those of terrestrial vertebrates B) an armored, jawed placoderm with two pairs of appendages C) an early ray-finned fish that developed bony skeletal supports in its paired fins D) a salamander that had legs supported by a bony skeleton but moved with the side-to-side bending typical of fishes E) an early terrestrial caecilian whose legless condition had evolved secondarily
Which number identifies a structure that aids in attachment?
a. 1 b. 2 c. 3 d. 7 e. 8
Most of the eukaryotic genomes described in the text have more than ________
A) 50 chromosomes B) 50,000 genes C) ten million genes D) 100,000 genes E) a million base pairs
Nicotine synthesis is a(n) adaptation of plant chemical defense against insects. Indicate whether the statement is true or false