Most bacterial intestinal infections may be traced to
A. Vibrio spp.
B. C. jejuni.
C. Salmonella spp.
D.
Enterobacteriaceae.
E. All of the choices are correct.
E
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A cross between two purple flowers that are heterozygous for their traits is an example of a ________
a. monohybrid cross b. dihybrid cross c. Punnett square d. test cross e. None of these choices.
-ray crystallography revealed several important features of the shape of DNA. Which one of the
following facts about DNA was NOT revealed by X-ray crystallography? A. The shape of the molecule is helical. B. The amount of purine bases equals the amount of pyrimidine bases. C. The molecule has a constant diameter. D. The phosphate groups are located on the outside. E. All of these were revealed by X-ray crystallography.
What does it mean if a plant is dioecious?
A. The sporophyte and the gametophyte are on the same plant. B. There are separate male and female sporophytes. C. Pollination and fertilization are separate events. D. There is double fertilization of the embryo.
Photophosphorylation during photosynthesis differs from oxidative phosphorylation during cellular respiration in that
A) it involves an electron transport chain. B) energy is stored in the form of a proton (H+) concentration difference. C) generation of ATP is driven by a flow of protons (H+) through ATP synthase. D) the final electron acceptor is NADP+ and not oxygen.