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.
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.
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