Smooth muscles are NOT
a. striated and voluntary.
b. isolated, spindle-shaped cells.
c. found in the walls of hollow structures such as blood vessels and the stomach.
d. involuntary and nonstriated.
e. associated with the parasympathetic nervous system “rest and digest” phase
A
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Cholesterol
a. has a rigid backbone of four carbon rings. b. is the most common sterol in animal tissue. c. is a lipid without a fatty-acid component. d. is needed to produce sexual development and maturity. e. is all of these.
All of the following statements about telomeres and telomerase are true EXCEPT that ________
A) telomeres shorten as cells age (senescence) B) telomerase minimizes telomere shortening C) telomerase activity is high in adult cells D) telomerase activity is high in embryonic stem cells E) None of these choices
The nutrients utilized by the Archaea were most likely
A. sugars and proteins. B. CO2, CO, H2, H2S, N2, and S. C. vitamins and minerals. D. carbohydrates and fats.
Ribozymes are
A. catalysts for DNA splicing. B. ribosomes which catalyze reactions. C. catalysts for RNA editing. D. unique to prokaryotes. E. unique to eukaryotes.