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.

Biology & Microbiology

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If a fungal colony is described as rugose, then it means that the colony:

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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

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Which RNA is the first to be activated in the

process of protein synthesis?

a. mRNA b. tRNA c. rRNA d. dRNA e. sRNA

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A 30× objective and a 20× ocular produce a total magnification of ________.

A. 50× B. 230× C. 320× D. 600×

Biology & Microbiology