Which of the following invertebrates is NOT a
protostome?
a. annelids
b. mollusks
c. echinoderms
d. arthropods
e. flatworms
C
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Which of the following best describes mollusks?
A. They are bilaterally symmetrical and have a soft body always covered with a shell. B. They have radial body symmetry and a soft body always covered with a shell. C. They have radial body symmetry and a soft body sometimes covered with a shell. D. They are bilaterally symmetrical and have a soft body sometimes covered with a shell.
A single contraction of all the muscle fibers in a motor unit is known as ____
a. a muscle twitch b. tetanus c. summation d. relaxation coupling e. isometric contraction
Which structure or structures function to open and close the stomata?
a. cuticle b. mesophyll c. palisade cells d. guard cells e. chloroplasts
A chemical that inhibits beta-lactamase enzymes is
A. imipenem. B. aztreonam. C. clavulanic acid. D. synercid. E. penicillinase.