A Level Biology Practice Exam

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Master the A Level Biology Exam. Use flashcards and multiple choice questions with hints and explanations to ace your test. Start your journey to excellence!

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What does ribosomal rRNA do?

It catalyzes chemical reactions in cells
It forms the structure of ribosomes
It transports amino acids to ribosomes
It acts as a genetic messenger

The correct answer is: It forms the structure of ribosomes

Ribosomal rRNA (rRNA) plays a critical role in the structure and function of ribosomes, which are the cellular machinery responsible for protein synthesis. As a key component of ribosomes, rRNA provides the framework that gives ribosomes their shape and stability, allowing them to efficiently carry out the translation of messenger RNA (mRNA) into proteins. The other choices describe different functions that are not associated with ribosomal rRNA. Catalyzing chemical reactions is typically associated with enzymes, while the transport of amino acids to ribosomes is the function of transfer RNA (tRNA). Acting as a genetic messenger relates to messenger RNA (mRNA), which conveys genetic information from DNA to ribosomes for protein synthesis. Therefore, the role of ribosomal rRNA in forming the structure of ribosomes is fundamental to its function in the cell.