Which type of RNA has a cloverleaf structure?

✅Explanation:
Only tRNA (transfer RNA) has a characteristic cloverleaf structure. This structure is essential for its function in protein synthesis, where it carries specific amino acids to the ribosome for incorporation into the growing polypeptide chain.

• Here's why the other options are incorrect:
● mRNA (messenger RNA): mRNA carries the genetic code from DNA to the ribosome but does not have a specific secondary structure like the cloverleaf. It is typically a single-stranded molecule.
● rRNA (ribosomal RNA): rRNA forms the core structure of ribosomes and has a complex folded structure, but it does not resemble a cloverleaf.
● All of the above: As explained above, only tRNA has the cloverleaf structure.

🛑 Related Terminology:
● Cloverleaf structure: A secondary structure of tRNA with four loops and four stems arranged in a cloverleaf shape.
● Anticodon: A triplet sequence on tRNA that recognizes and binds to the complementary codon on mRNA.
● Aminoacyl group: An amino acid attached to tRNA for protein synthesis.
● Ribosome: The cellular organelle responsible for protein synthesis.
● Polypeptide chain: A chain of amino acids linked together to form a protein.