If ____ mutation(s) occur(s) in snails, the direction of coiling may reverse, which ____ mating
a. 1; encourages
b. 1; prohibits
c. 2; encourages
d. 2; prohibits
e. 3; encourages
B
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What is the difference between a coenzyme and a prosthetic group?
A) Coenzymes are essential for an enzyme's function and prosthetic groups only enhance its reaction rate. B) Coenzymes are weakly bound whereas prosthetic groups are strongly bound to their respective enzymes. C) Coenzymes are organic cofactors and prosthetic groups are inorganic cofactors. D) Coenzymes require additional ions to bind to enzymes but prosthetic groups are able to directly interact with enzymes.
Respiration is controlled by
(a) chemoreceptors. (b) stretch receptors. (c) centers in the brain stem. (d) all of the above.
Which of the following eukaryotic RNA polymerases is responsible for transcribing ribosomal RNAs (rRNAs)?
A. RNA Pol I B. RNA Pol II C. RNA Pol III D. RNA Pol I and RNA Pol III E. RNA Pol II and RNA Pol III
Voltage-sensitive K+ channels are 1,000 times more permeable to K+ than to Na+ because
a. K+ ions are smaller than Na+ ions. b. K+ ions have a lower charge density than Na+ ions. c. a selectivity filter removes the water molecules from K+ ions but not from Na+ ions. d. K+ ions are more concentrated inside the cell than outside the cell.