Osmosis is the
A. net movement of water across a differentially permeable membrane.
B. diffusion of any molecule across a differentially permeable membrane.
C. net movement of water from an area of low concentration to an area of high concentration.
D. movement of any molecule from an area of high concentration to an area of low concentration.
A. net movement of water across a differentially permeable membrane.
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The type of movement of molecules that is specific and passive, and which becomes saturated if all of the protein carriers are in use is
A. exocytosis. B. facilitated diffusion. C. active transport. D. endocytosis. E. osmosis.
Why would streptomycete bacteria be of particular interest to a pharmaceutical company? (Select all correct choices.)
A. Streptomycete bacteria produce antibiotic or anti-fungal-like compounds. B. All streptomycete bacteria are antibioticresistant. C. Streptomycete bacteria have cell walls made of lignin and not peptidoglycan. D. Streptomycete bacteria change color when exposed to antibiotics.
One of the reasons that pufferfish are a good species to compare to humans is because
A. it is so easy to hybridize the two and investigate the consequences. B. they are so distantly related that it's easy to distinguish mutually conserved sequences. C. the introns are often identical. D. of the rapid response time in pufferfish to artificial selection. E. they have been separated for so many millions of years and yet the gene sequence is almost identical.
If all offspring of a cross have the genotype Aa, the parents of the crosses would most likely be
a. AA ? aa. b. Aa ? Aa. c. Aa ? aa. d. AA ? Aa. e. none of these.