The flow of nutrients through living organisms
is best characterized as
a. circular.
b. a ladder.
c. a web.
d. one way.
e. a funnel.
A
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Parallel ? sheets differ from antiparallel ? sheets because:
A. neighboring amino acids are on one rather than both sides of the sheet. B. large aromatic groups are only allowed with parallel sheets. C. parallel sheets can form between a single polypeptide. D. the N-to-C orientation of all the ? strands are aligned. E. hydrogen bonds are crucial for stability.
The best microscope to use to view internal
features of specimens is the a. basic light microscope. b. phase contrast light microscope. c. Nomarski process light microscope. d. scanning electron microscope. e. transmission electron microscope
Most of the water vapor in the earth's
atmosphere comes from evaporation from a. lakes. b. rivers. c. land. d. oceans. e. plants.
A mutation occurs that changes a C to a T in DNA such that, in the mRNA transcribed from this piece
of DNA, a UGG codon is changed to UGA. This mutation is a A. substitution mutation. B. missense mutation. C. nonsense mutation. D. substitution mutation and a missense mutation. E. substitution mutation and a nonsense mutation.