Most digestion take place in the
a. stomach.
b. small intestine.
c. large intestine.
d. stomach and small intestine equally.
e. small and large intestine equally
B
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Which of the following is not a component of a yeast three-hybrid analysis?
A. a fusion protein of LexA, which binds the reporter construct, and MS2, which specifically binds an RNA tag that has been added to every RNA produced by the plasmid library B. a plasmid library that contains random sequences from the genome tagged with a unique hairpin sequence that MS2 will bind C. a reporter construct that contains a LexA operator (binding site) and a reporter gene; activation of the reporter gene is either required for growth of the bacteria or catalyzes a reaction that forms a colored product D. a fusion protein containing the protein of interest fused to the activation domain that will activate transcription of the reporter gene when bound E. a fusion protein of the protein of interest and two tags?the calmodulin binding site and protein A
Variation that approximates a bell-shaped curve when plotted on a bar graph is
a. undergoing disruptive selection. b. undergoing stabilizing selection. c. quantitative variation. d. qualitative variation. e. in genetic equilibrium.
What area of water serves as nursery grounds for many species of marine fishes and invertebrates?
a. photic zones b. benthic zones c. estuaries d. pelagic zones e. limnetic areas
What free-living organisms developed into both mitochondria and chloroplasts?
A) protists B) animals C) bacteria D) plants