BIO NMDCAT Ribonucleic acid (RNA)

nmdcat.online July 3, 2026

66. The primary regulatory role of microRNAs (miRNAs) within eukaryotic cells is to

A. Act as templates for structural protein assembly

B. Downregulate gene expression by targeting mRNA for degradation

✓

C. Catalyze peptide bond synthesis within the nucleolus

D. Guide the transport of mature tRNA to the cytoplasm

📝 Explanation

miRNAs are tiny, non-coding RNA molecules that associate with RISC complexes to pair with matching mRNAs and suppress translation.

📖 Additional Information

Act as templates for structural protein assembly
Downregulate gene expression by targeting mRNA for degradation
Catalyze peptide bond synthesis within the nucleolus
Guide the transport of mature tRNA to the cytoplasm

miRNAs are tiny, non-coding RNA molecules that associate with RISC complexes to pair with matching mRNAs and suppress translation.

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