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Multiple Choice
In the process of translation, what molecule binds to the A site on a ribosome?
A
Peptidyl-tRNA
B
Aminoacyl-tRNA
C
Ribosomal RNA
D
mRNA
Verified step by step guidance
1
Understand the process of translation: Translation is the process by which ribosomes synthesize proteins using mRNA as a template. It involves the decoding of mRNA into a polypeptide chain.
Identify the role of the ribosome: The ribosome has three sites for tRNA binding - the A site (aminoacyl site), the P site (peptidyl site), and the E site (exit site). Each site plays a specific role in the translation process.
Focus on the A site: The A site is where the incoming aminoacyl-tRNA binds. This tRNA carries the next amino acid to be added to the growing polypeptide chain.
Differentiate between the types of tRNA: Aminoacyl-tRNA is charged with an amino acid and is responsible for bringing new amino acids to the ribosome. Peptidyl-tRNA holds the growing polypeptide chain and is located at the P site.
Conclude the binding process: During translation, the aminoacyl-tRNA binds to the A site of the ribosome, allowing the ribosome to add the amino acid to the polypeptide chain.