. If the side chains of amino acids contain carboxyl (-COOH) groups, they
A. contribute a positive charge to the amino acid at pH 10.
B. contribute a negative charge to the amino acid at pH 10.
C. have no effect on the charge of the amino acid at pH 10.
D. are considered acidic amino acids.
E. contribute a negative charge to the amino acid at pH 10 AND are considered acidic amino acids.
E
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The reason that the various Hawaiian
honeycreepers are vulnerable to extinction is a. the reduction of their habitats. b. the warming of their habitats, supporting mosquitoes that carry the pathogens for avian malaria. c. the encroachment of humans into their habitats. d. the importation of new predators and competitors into their habitats. e. all of these answers
The base analog, 5-bromouracil substitutes for the nucleotide base, _____________, in a DNA
molecule. Fill in the blank(s) with the appropriate word(s).
In Figure 41-3, point A is:
a. the resting state.
b. indicative of repolarization.
c. the threshold level.
d. the equilibrium potential.
e. indicative of hyperpolarization
Which molecule below does not act as a neurotransmitter and a hormone?
a) thyroid hormone b) glycine c) dopamine d) glutamate e) eicosanoids