What is the initiator triplet in both bacteria and eukaryotes? What amino acid is recruited by this triplet?
A) UAA, UGA, or UAG; no amino acid called in
B) UAA, UGA, or UAG; methionine
C) AUG; methionine
D) AUG; arginine
E) UAA, UGA, or UAG; arginine
Answer: C
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Studies have determined that ____ is not responsible for the cyclical rise and fall of arctic hare and lynx populations
a. predation b. a limited food supply for hares c. predation by other mammals d. intraspecies competition e. disease
following amino acid would be characterized as __________ based on the chemical properties of
its side chain.
a. nonpolar
b. acidic
c. basic
d. hydrophilic
e. electrically charged
Experiments on competition among species within a community reveal that
A) removing a group of species has relatively little effect on a community. B) removing a single species has a stronger effect than removing a group of species from a community. C) removing a group of species has a stronger effect than removing a single species from a community. D) removing a single species has relatively little effect on a community.
What percentage of Earth's productive land is currently used by the human population for crops and livestock?
A) 20% B) 75% C) 40% D) 55% E) 90%