Type I topoisomerases differ from type II topoisomerases in that the type I enzymes ________
A) decrease the linking number (L) of a double helix
B) ligate fragments of DNA that have been hydrolyzed
C) cleave both strands of a double helix
D) induce negative supercoiling
E) cleave one strand of a double helix
Answer: C
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The cap on an mRNA is the site where
a. ribosomes attach at the start of translation. b. the start codon is located. c. the process of translation ends. d. the stop codon is covered until needed. e. the mRNA is protected from attack by RNA-digesting enzymes.
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Indicate whether the statement is true or false
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