The space between the branched nerve endings and the muscle cell membrane is called a
a. myelin sheath.
b. synapse.
c. dendrite.
d. gap junction.
e. tight junction.
B
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Which of the following molecules is an amino acid with a hydrophobic R-group or side chain?
A) 3 B) 7 C) 10 D) 12 E) 13
What type of covalent bond between amino acid side chains (R-groups) functions in maintaining a polypeptide's specific three-dimensional shape?
A) ionic bond B) hydrophobic interaction C) van der Waals interaction D) disulfide bond E) hydrogen bond
Which of the following statements is false?
A. Shortening a muscle prior to contraction reduces the energy consumption of that muscle. B. Slower contraction velocities generate larger forces than more rapid contraction velocities. C. Lengthening contractions generate more force than shortening contractions. D. Isometric contractions occur when a muscle generates force without changing length. E. Rapid and repetitive stretching of a muscle can result in injury.
Which condition is LEAST correlated with a decrease in atmospheric ozone?
a. more serious sunburns b. loss of ocean phytoplankton c. increased incidence of skin cancers d. decreased levels of atmospheric carbon dioxide e. increased occurrences of cataracts