An enzyme can
A. reduce the rate of a chemical reaction.
B. increase the rate of a chemical reaction as much as two times.
C. increase the rate of a chemical reaction as much as ten times.
D. increase the rate of a chemical reaction as much as several thousand times.
D. increase the rate of a chemical reaction as much as several thousand times.
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If the concentration of thyroid hormone is high, ____
a. the secretion of thyroid releasing hormone is inhibited b. the secretion of thyroid stimulating hormone is increased c. calcitonin production is increased d. resting metabolism decreases e. more than one of these occurs
Four of the following are viral diseases. Which one is the exception?
a. herpes b. measles c. bubonic plague
d. hepatitis e. chicken pox
Compared with prokaryotic chromosomes, eukaryotic chromosomes are ________
A) large, linear, less densely packed with protein-coding genes, mainly organized in single-gene units with introns B) small, mainly organized in polygenic transcription units without introns C) large, mainly organized in polygenic transcription units without introns D) small, mainly organized in-single gene transcription units with introns E) large, mainly organized in single-gene transcription units without introns
How are the structures of RNA and DNA similar?
A. Their sugar-phosphate backbones are formed by phosphodiester linkages. B. Adenine pairs with thymine in both. C. They both have the same tertiary structure. D. They both contain the sugar ribose.