Multiple choice

Translation of mRNA into a ribosome proceeds _______.

  1. from the 3' end to the 5' end

  2. from the 5' end to the 3' end

  3. from the middle to the 3' end and then from the middle to the 5' end

  4. from either the 5' or 3' end, depending on the enzymes present

  5. from the middle simultaneously toward the 3' and 5' ends
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ribosomes read mRNA in the 5' to 3' direction during translation. As the ribosome moves along the mRNA, it reads codons sequentially and adds amino acids to the growing polypeptide chain. The 3' to 5' option describes the template strand direction during DNA replication, not translation.

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