The study of phylogeny allows us to:
a. understand the major events in evolutionary history.
b. understand the history of descent.
c. understand the relationships among taxa of organisms.
d. All of the above.
D
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Muscle cells are stimulated by acetylcholine released from the terminals of
A. transverse tubules. B. motor neuron axons. C. sensory cell axons. D. motor neuron dendrites. E. sensory cell dendrites.
Which of the following statements about plant toxins against herbivores is false?
A. The toxin may be kept in a membrane-bound structure to keep it from harming the plant. B. The toxin may not be toxic unless it is metabolized in the intestine of a herbivore. C. The toxin may have also have a bad taste. D. Even a little bit of the toxin will be deadly. E. Some toxins can over stimulate particular physiological processes.
The type(s) of bond produced when atoms with somewhat different electronegativities share electrons is/are
A) a nonpolar covalent bond. B) a polar covalent bond. C) an ionic bond. D) a hydrogen bond. E) both nonpolar covalent and ionic bonds.
Fully folded proteins typically have polar side chains on their surfaces, where electrostatic attractions and hydrogen bonds can form between the polar group on the amino acid and the polar molecules in the solvent
In contrast, some proteins have a polar side chain in their hydrophobic interior. Which of the following would not occur to help accommodate an internal, polar side chain? (a) A hydrogen bond forms between two polar side chains. (b) A hydrogen bond forms between a polar side chain and the protein backbone. (c) A hydrogen bond forms between a polar side chain and an aromatic side chain. (d) Hydrogen bonds form between polar side chains and a buried water molecule.