Common RNA Types in Prokaryotes and Eukaryotes

Steps:

• Identify the three primary RNA types for protein synthesis: mRNA, tRNA, rRNA.
• Verify mRNA presence: it carries genetic code from DNA to ribosomes in both cell types.
• Verify tRNA presence: it delivers amino acids during translation in both prokaryotes and eukaryotes.
• Verify rRNA presence: it structures ribosomes essential for protein assembly in both.

Why A is correct:

• mRNA, tRNA, and rRNA are universally present in prokaryotic and eukaryotic cells for core translation processes, matching ✓ ✓ ✓ for all three types.

Why the others are wrong:

• B: Assumes four types but marks one (e.g., snRNA) absent in prokaryotes (x), which overcomplicates the core set.
• C: Marks only two types present (✓ ✓) and two absent (x x), ignoring rRNA's universal role.
• D: Marks just one type present (✓) and three absent (x x x), underrepresenting the shared RNAs.

Final answer: A