The anticodon of tRNA:Select one:a. Binds to rRNAb. Binds to Shine Dalgarno sequencec. Binds to an amino acidd. Binds to an mRNA codon

Understanding the Anticodon of tRNA

1. Definition of Anticodon: The anticodon is a sequence of three nucleotides in tRNA (transfer RNA) that is complementary to a corresponding codon in mRNA (messenger RNA).

2. Function of Anticodon: The primary function of the anticodon is to ensure that the correct amino acid is added to the growing polypeptide chain during protein synthesis.

Analyzing the Options

1. Option a: Binds to rRNA: This is incorrect. The anticodon does not bind to ribosomal RNA (rRNA); instead, it interacts specifically with codons on mRNA.

2. Option b: Binds to Shine-Dalgarno sequence: This is also incorrect. The Shine-Dalgarno sequence is a ribosomal binding site in bacterial mRNA, and it does not involve the tRNA anticodon.

3. Option c: Binds to an amino acid: This option is misleading. While tRNA carries an amino acid, the anticodon itself does not bind to an amino acid directly. The amino acid is attached to the 3' end of tRNA.

4. Option d: Binds to an mRNA codon: This is correct. The primary role of the anticodon is to bind to the complementary codon on the mRNA, facilitating the incorporation of the correct amino acid during translation.

Final Answer

The correct answer is d. Binds to an mRNA codon.