RNA and Proteins Combine in Cells to Form Structures Called

question 24

Multiple Choice

RNA and proteins combine in cells to form structures called ribosomes. Ribosomes contain the active site for peptide bond formation. Based on their chemical structures, do you think protein or RNA molecules actually form the active site within the ribosome?

• A) protein, because RNA cannot catalyze reactions
• B) RNA, because proteins cannot catalyze a reaction that involves another protein
• C) proteins, because only proteins can catalyze a reaction that involves another protein
• D) It could be either, because both molecules have catalytic properties.

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