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Translation of a messenger RNA sequence occurs in four phases.

The first phase occurs when

A

the ribosome assembles around the target mRNA after the mRNA attaches and the first UUG or start codon is read.

B

the ribosome assembles around the target mRNA after the mRNA attaches and the first AUG or start codon is read.

C

the ribosome adds amino acids to the growing polypeptide chain.

D

the ribosome releases the mRNA after a stop codon is recognized by the ribosome.

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