Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a
A. pleated sheet.
B. hollow cylinder.
C. ribbon.
D. icosahedron.
E. helix.
Answer: E
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Which of the following forms of oxygen is/are generally toxic to living organisms?
A) superoxide anion B) hydrogen peroxide C) hydroxyl radical D) superoxide, hydrogen peroxide, and hydroxyl radicals are all toxic
The side group (R group) of the amino acid shown above contains which of the following functional
groups?
a. hydroxyl b. carbonyl c. carboxyl d. sulfhydryl e. amino
A stage 3 society, based on the demographic transition model, would be characterized by all of the
following except ____.
a. an r value > 0 b. industrialization c. a clumped population distribution d. (K ? N)/K approaching 1 e. an r value approaching 1
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a. voluntary b. involuntary c. voluntary and involuntary d. oxygen mediated e. ATP mediated