Question

The number of nucleotides in tRNA is ________ .

• A. 40 - 50
• B. 50 - 60
• C. 70 - 80
• D. 90 - 100

Hint:

tRNA size = small RNA (~75 nucleotides) — easy to remember for MCQs.

Answer 1

The Correct Option is C

Concept:
Transfer RNA (tRNA) is a small RNA molecule involved in protein synthesis. It carries amino acids to the ribosome and matches them with the appropriate codons on mRNA.

Step 1: Recall structure of tRNA. tRNA has a cloverleaf structure with:
• Anticodon loop
• Amino acid attachment site
• D-loop and T$\psi$C loop

Step 2: Recall nucleotide length. Typical tRNA molecules consist of about 70–80 nucleotides.

Step 3: Analyze options.
• (A) 40–50 → Too small $\times$
• (B) 50–60 → Less than actual $\times$
• (C) 70–80 → Correct range \checkmark
• (D) 90–100 → Larger than typical $\times$

Step 4: Conclusion. \[ \text{tRNA contains approximately 70–80 nucleotides} \]