Which of the following channels would not be expected to generate a change in voltage by movement of its substrate across the membrane where it is found?
(a) an aquaporin
(b) a sodium channel
(c) a calcium channel
(d) a proton channel
(a) Aquaporin channels are found in the plasma membrane of some cells, where they facilitate diffusion of water across the membrane. Because water is an uncharged molecule, its movement would not be expected to alter the voltage across the membrane.
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The distribution of social animals is likely to
be a. clumped. b. random. c. uniform. d. constant. e. homogeneous
A researcher observed a reduction in the number of chromosomes during cell division for a microbe, he concludes that the microbe must be
A. Prokaryotic B. Eukaryotic C. a virus D. An archaean
Microscopically, this fungus appears barrel shaped with thick walls, which best describes which type of conidia?
a. Macroconidia b. Chlamydoconidia c. Arthroconidia d. Blastoconidia
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