Bacteria living in a freshwater stream that are moved to salty seawater would
A. now be in a hypotonic solution.
B. gain water as a result of the move.
C. shrivel as a result of the move.
D. now be in a isotonic solution.
Answer: C
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The phenotypic differences between chimps and humans is best explained by ______________
A. the high variation in number of different genes between the two species B. the high number of inversion sequences C. epistatic changes to genes D. patterns of gene expression and regulation E. the large amount of “junk DNA” found in chimpanzee genomes
Which of the following statements about the colon is NOT true?
A. The colon is active in water absorption, removing about 95% of the water that enters it and returning it to the bloodstream. B. Feces consists of about 25% water and 75% solids that are mainly bacteria from the intestinal tract. C. Insufficient absorption of water can result in diarrhea that may be life-threatening. D. Cells in the walls of the large intestine absorb vitamin K that is produced by bacteria resident in the colon. E. The last section of the colon is the rectum, which terminates in the anus.
What is the main adaptive advantage of the C4 and CAM photosynthesis strategies over the C3 strategy?
A) They help the plant synthesize glucose efficiently under dry conditions. B) They allow the plant to fix carbon under conditions of low CO2. C) They allow the plant to fix carbon in cool conditions. D) They make it possible for the plant to use the Calvin cycle at night.
Host specificity of Rhagoletis pomonella reduces gene flow between the apple and hawthorn races by 4% to 6% in each generation. This is an example of:
a. allopatric speciation. c. secondary contact. b. assortative mating. d. resource competition.