Which one of the following is characteristic of cardiac and smooth muscle, but not skeletal muscle?
A) voluntary contraction
B) striated appearance
C) presence of gap junctions
D) presence of actin and myosin in muscle cells
E) contraction is initiated by motor neurons
C
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The virus that causes chickenpox can also cause ______ decades later when it switches from the latent state and starts making new viral particles
A. shingles B. herpes C. cold sores D. mononucleosis
Intramolecular protein splicing results in the formation of the final protein and the
A) protease. B) proteasome. C) inteins. D) exteins. E) None of these.
The extracellular matrix of animal cells ________
A) protects and support cells B) provides avenues for the exchange of DNA C) is a warehouse for the storage of extra lipids and carbohydrates D) is primarily a site of dead matter and waste materials
Rapid cell proliferation can result from
a. a mutation inhibiting the action of a positive growth regulator. b. the surgical removal of a benign polyp. c. contact inhibition. d. a cell ignoring a negative growth regulator.