Some cells have aquaporins—channels that facilitate the flow of water molecules through the plasma membrane. For these cells, what regulates the rate and direction of water diffusion across the membrane?
(a) aquaporin conformation
(b) resting membrane potential
(c) solute concentrations on either side of the membrane
(d) availability of ATP
(c)
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What is a trace fossil?
A. a small fossil B. fossil evidence of organisms other than conventional fossils of hard body parts C. a fossil which is part of a series of fossils that trace the evolution of a group of species D. a fossil that allows scientists to trace the movement of the fossilized organism
Species such as mice have a better chance of surviving sudden environmental change than elephants because elephants
A. reproduce much more slowly than mice. B. have a more selective diet than mice. C. live longer than mice. D. require larger habitats than mice. E. eat more than mice.
Which of the following best describes the relationship between DNA, proteins, and RNA?
A. DNA is transcribed into RNA, then RNA is translated into proteins. B. DNA is transcribed into proteins, then proteins are translated into RNA. C. DNA is translated into RNA, then RNA is transcribed into proteins. D. DNA is translated into proteins, then proteins are transcribed into RNA.
What human organ cleans fifty gallons of blood every day?
A. Livers B. Kidney C. Heart D. Stomach