In translation, mRNAs are read in the _______ direction, and polypeptide chains are synthesized from the _______ ends.
A) 5ʹ to 3ʹ; carboxyl to the amino
B) 5ʹ to 3ʹ; amino to the carboxyl
C) 3ʹ to 5ʹ; carboxyl to the amino
D) 3ʹ to 5ʹ; amino to the carboxyl

Question

Quizplus · Accepted Answer

mRNAs are read in the 5ʹ to 3ʹ direction, meaning that the nucleotides are added to the growing chain in the 5ʹ to 3ʹ direction. Polypeptide chains are synthesized from the amino to the carboxyl ends, meaning that the amino acid at the start of the chain is closest to the amino end of the polypeptide, and the carboxyl end is where the last amino acid is added. Therefore, the correct option is B.

In Translation, MRNAs Are Read in the _______ Direction, and Polypeptide