All of the following statements are true about restriction enzymes EXCEPT
A. hundreds of different ones have been isolated and purified.
B. they are made by bacteria and viruses.
C. each enzyme cuts DNA at a different specific base sequence.
D. they produce single-stranded complementary ends that can join to two different DNA strands by complementary base-pairing.
Answer: B
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During the "gap" phases of the cell cycle, most of the activity is directed toward
a. DNA replication. b. nuclear membrane synthesis. c. resting for the next step. d. sorting the chromosomes. e. processes required for cell division.
In a bacterial species, 20% of the bases in its DNA are C. What percent of the bases are G?
A) 80% B) 40% C) 20% D) 10%
Which of the following would represent the strand of DNA from which the mRNA strand CUCAAGUGCUUC was made?
A.) CUCAAGUGCUUC B.) GAGUUCACGAAG C.) GAGTTCACGAAG D.) AGACCTGTAGGA
Which of the following statements are/is TRUE
A. Endotoxins are more pyrogenic than exotoxins B. Exotoxins are more antigenic than endotoxins C. All choices are TRUE statements D. Exotoxins are more toxigenic than endotoxins E. One of these choices is FALSE