Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a
A. helix.
B. ribbon.
C. hollow cylinder.
D. pleated sheet.
E. icosahedron.
A. helix.
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a. epistasis
a. nucleoid b. nuclear membrane c. nucleus d. chromatin
Menstruation begins in response to
a. rising levels of FSH and LH. b. rising levels of GnRH. c. rising levels of progesterone. d. falling levels of progesterone. e. rising levels of estrogen.
Protein synthesis on the primordial Earth may have been catalyzed by ____ before the evolution of enzymes
a. lightning b. RNA c. carbohydrates d. amino acids e. DNA
The mixing of atmospheric air within the dead space of the conducting zone of the lung upon inspiration results in a partial pressure of
A) oxygen in the alveoli that is higher than atmospheric. B) nitrogen in the alveoli that is higher than atmospheric. C) oxygen in the alveoli that is lower than atmospheric. D) carbon dioxide in the alveoli that is lower than atmospheric. E) water vapor in the alveoli that is lower than atmospheric.