In the disease myasthenia gravis, there is a deficiency of acetylcholine receptors at the neuromuscular junction. This shortage blocks contraction by preventing
A. generation of action potentials in the motor neuron.
B. opening of the T-tubule system.
C. release of Ca2+ from the sarcoplasmic reticulum.
D. the interaction of troponin with tropomyosin.
E. generation of action potentials in the muscle fiber.
E. generation of action potentials in the muscle fiber.
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If a fungal colony is described as rugose, then it means that the colony:
a. is furrowed or convoluted. b. is slightly raised in the center. c. furrows radiate out from the center. d. has a smooth surface with no aerial myce-lium.
What factor is a major reason for the success of reptiles?
a. Amniotic egg b. Rearing of juveniles c. Advanced circulatory system d. Skin covered with tough scales
Which RNA is the first to be activated in the
process of protein synthesis?
a. mRNA b. tRNA c. rRNA d. dRNA e. sRNA
A 30× objective and a 20× ocular produce a total magnification of ________.
A. 50× B. 230× C. 320× D. 600×