Assume a mutation in the CCA arm of tRNAThr occurs that reduces the flexibility of this region of the molecule but still allows the 3′ end of the tRNA to enter the aminoacyl-tRNA synthetase activation site. Which of the following is the most likely outcome?单项选择题

A

The tRNAThr may become charged with Ser but will not undergo proofreading.

B

The tRNAThr will never be attached to Ser.

C

he tRNAThr will never be attached to Thr.

D

The tRNAThr may become charged with Ser but will undergo proofreading to remove the Ser.

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