When considering DNA and RNA, which of the following statements is generally FALSE?
a. There are five major types of nitrogenous base.
b. There are two types of purines and three types of pyrimidines.
c. There are two types of purines and two types of pyrimidines.
d. A free 3' hydroxyl group is found in deoxyribose.
e. A free 3' hydroxyl group is found in ribose.
Ans: c
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The productivity and area hypotheses together suggest that a large, tropical continent would likely have __________ species richness.
A. low B. mature C. poor D. cyclical E. high
Which of the following is not true of bacterial plasmids?
A. They are required for host growth and/or reproduction. B. They can replicate independently of the chromosome. C. They may carry genes for drug resistance. D. They may carry genes that enhance survival of the bacterium under certain conditions.
Ribose has five carbon atoms, of which three are asymmetric. What is the maximum number of stereoisomers that may exist for ribose?
A) 2 B) 4 C) 6 D) 8 E) 10
Two or more atoms bonded together are called a/an
A. electrolyte. B. element. C. ion. D. molecule. E. isotope.