Explain the roles of ribosomal A, P, and E sites during translation.

• A. A site binds incoming aminoacyl-tRNA; P site holds growing polypeptide; E site is where deacylated tRNA exits.
• B. A site holds growing polypeptide; P site binds tRNA; E site recruits ribosomal subunits.
• C. A site holds deacylated tRNA; P site binds growing polypeptide; E site releases the anticodon.
• D. All three sites are interchangeable with no specific roles.

Answer: (A)