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Multiple Choice
Which of the following are synthesized in the nucleolus?
A
Messenger RNA (mRNA)
B
DNA
C
Transfer RNA (tRNA)
D
Ribosomal RNA (rRNA)
Verified step by step guidance
1
Begin by understanding the function of the nucleolus. The nucleolus is a region within the nucleus of eukaryotic cells where ribosomal RNA (rRNA) is synthesized and assembled with proteins to form ribosomal subunits.
Consider the types of RNA involved in protein synthesis: Messenger RNA (mRNA), Transfer RNA (tRNA), and Ribosomal RNA (rRNA). Each has a distinct role in the process.
Messenger RNA (mRNA) is synthesized in the nucleus but not specifically in the nucleolus. It carries genetic information from DNA to the ribosome, where proteins are synthesized.
Transfer RNA (tRNA) is also synthesized in the nucleus but not in the nucleolus. It helps decode mRNA sequences into proteins by bringing amino acids to the ribosome during translation.
Ribosomal RNA (rRNA) is synthesized in the nucleolus. It forms the core of ribosome's structure and catalyzes protein synthesis. Therefore, the nucleolus is primarily responsible for the synthesis of rRNA.