Question

question 12 of 20 : select the best answer for the question. 12. ______ is part of the ribosome, helping to catalyze protein synthesis. a. rrna b. trna c. sirna d. mrna mark for review (will be highlighted on the review page) << previous question next question >>

Explanation:

To solve this, we analyze each option:

• Option A: rRNA (ribosomal RNA) is a major component of ribosomes and has catalytic activity (ribozyme) in protein synthesis.
• Option B: tRNA (transfer RNA) functions in bringing amino acids to the ribosome, not as a ribosomal component with catalytic role in synthesis.
• Option C: siRNA (small interfering RNA) is involved in RNA interference, not protein synthesis or ribosomal structure.
• Option D: mRNA (messenger RNA) carries the genetic code from DNA to the ribosome but is not part of the ribosome's catalytic core for synthesis.

So, rRNA is part of the ribosome and helps catalyze protein synthesis.

Answer:

A. rRNA