The difference between a Class I and a Class II tRNA synthetase is:
A. the Class I synthetase requires ATP cofactor and the Class II does not.
B. the Class I synthetase uses the 2'-OH of 3' end of the tRNA as a nucleophile and the Class II uses the 3'-OH.
C. the Class II synthetase reaction requires a transesterification reaction not necessary in the Class I reaction.
D. the Class II synthetases are typically monomeric, whereas the Class I enzymes frequently function as multimeric protein complexes.
B
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How many hydrogen bonds are there between cytosine and guanine?
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