A muscle fiber contracts by a sequence of events initiated by the binding of acetylcholine to its receptor. Which of the following is the correct sequence?
I-The calcium-troponin complex pulls tropomyosin away from the myosin binding sites of actin.
II-The freed-sites of actin bind to myosin to form cross bridges.
III-Calcium ion binds to the troponin.
A. II, III, and I
B. III, II, and I
C. III, I, and II
D. I, III, and II
E. I, II, and III
C. III, I, and II
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All of the following are found in eukaryotic cells EXCEPT
a. a nucleus. b. a mitochondrion. c. a nucleoid. d. ribosomes.
The type of viral infection in which a virus enters a host cell, immediately replicates, and causes the host cell to burst is a infection.
A. systematic B. transgenic C. lytic D. lysogenic E. rare form of viral
A unique feature of ________ is that they are tissue-specific
Fill in the blank with correct word.
Motor or ____________ neurons transmit nerve impulses away from the CNS.
a) afferent b) efferent c) central d) peripheral