20. The enzyme ________performs the charging of amino acid to its cognate tRNAs. (A) aminoacyl-transferase (B) small ribosome tRNA synthetase (C) large ribosome (D) aminoacyl-

1. Skin cells and neuron cells in an individual show very distinct morphology and function, but they carry identical genome. How can this occurs? (A) Different mutations occur in different cell types； (B) Different parts of genome are lost in different cell types； (C) Different sets of genes are expressed in different cell types； (D) Different chromosomes are inactivated in different cell types.

20. The enzyme ________performs the charging of amino acid to its cognate tRNAs.
(A) aminoacyl-transferase
(B) small ribosome tRNA synthetase
(C) large ribosome
(D) aminoacyl-

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