RNA structure and types Transitional Reasoning Download PDF

Questions

1. 1.

   A molecular biology student investigates three unknown RNA samples (Sample 1, Sample 2, and Sample 3) isolated from a eukaryotic cytoplasm. Chemical analysis reveals that Sample 1 acts as a ribozyme to catalyze peptide bond formation during translation, Sample 2 contains intramolecular base-paired stems and loops while carrying an amino acid at its 3' terminal end, and Sample 3 is a single-stranded transcript whose nucleotide sequence is read in consecutive triplets by the ribosome. Based on these observations, which conclusion regarding the structure and roles of these RNA molecules is correct?

   • A) Sample 3 possesses extensive intramolecular hydrogen bonds that determine its catalytic activity during polypeptide assembly.
   • B) Sample 1 functions primarily as an adaptor molecule that binds directly to anticodons on Sample 2.
   • C) Sample 2 and Sample 3 both contain deoxyribose sugars in their backbone, distinguishing them chemically from Sample 1.
   • D) Sample 1 and Sample 2 both maintain stable secondary structures via hydrogen bonding, whereas Sample 3 provides the sequential genetic blueprint for translation.