Practice question
Question
On a ribosome, the mRNA is read from………….and the polypeptide chain is synthesized from:
Explanation
Ribosomes translocate 5' to 3' along mRNA decoding codons in that direction. Polypeptide synthesis proceeds amino to carboxyl as peptidyl transferase adds incoming aminoacyl-tRNA at C-terminus. Thus nascent chain grows N to C while message is read 5' to 3'.
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