Biology STAAR (State of Texas Assessments of Academic Readiness) Practice Test

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Prepare for the Biology STAAR Exam with our interactive test. Utilize flashcards and multiple-choice questions with detailed explanations and hints. Ace your exam confidently!

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What is the primary function of rRNA?

To transport amino acids
To make up ribosomes
To copy DNA
To deliver genetic information

The correct answer is: To make up ribosomes

The primary function of ribosomal RNA (rRNA) is to make up ribosomes, which are the cellular structures responsible for protein synthesis. Ribosomes are composed of rRNA and proteins, and they serve as the site where messenger RNA (mRNA) is translated into polypeptides, ultimately forming proteins. In a functioning ribosome, rRNA plays a critical role in facilitating the interactions between mRNA and transfer RNA (tRNA) during the translation process, helping to position the mRNA and tRNA correctly in order to ensure that amino acids are linked in the proper sequence as dictated by the genetic code. This structural role is essential for the ribosome's function, and without rRNA, ribosomes would not be able to form or function properly, thereby hindering protein synthesis in the cell.