The main function of tRNA with regards to protein synthesis is:

Options

A. proofreading
B. identifies amino acids and transports them to ribosomes
C. Inhibits protein synthesis
D. all of these

Answer

**Step-by-Step Solution:**

1. **Understanding tRNA**: The full form of tRNA is transfer RNA. It plays a crucial role in the process of protein synthesis, specifically during the translation phase.

2. **Function of tRNA**: The main function of tRNA is to transport amino acids to the ribosome, where proteins are synthesized. Each tRNA molecule is specific to one amino acid and carries it to the ribosome.

3. **Amino Acid Identification**: tRNA molecules have an anticodon region that pairs with the corresponding codon on the mRNA strand. This ensures that the correct amino acid is added to the growing polypeptide chain.

4. **Ribosome Interaction**: Once the tRNA has identified and bound to its specific amino acid, it transports this amino acid to the ribosome. The ribosome is the site of protein synthesis where the amino acids are linked together in the order specified by the mRNA.

5. **Conclusion**: Therefore, the main function of tRNA in protein synthesis is to identify amino acids and transport them to the ribosome for incorporation into the protein being synthesized.

**Final Answer**: The main function of tRNA with regards to protein synthesis is to identify amino acids and transport them to the ribosome.

---