The true statement is:
The human body uses 20 amino acids to form all types of proteins.
To clarify the other statements:
- tRNA is attached to specific proteins in the cell’s cytoplasm. (tRNA carries amino acids to the ribosome, where proteins are synthesized, but it is not directly attached to proteins.)
- Amino acids do not need to be assembled in a particular order. (Amino acids must be assembled in a specific order determined by the mRNA template for the resulting protein to function correctly.)
- Amino acids form a polypeptide chain via carbon-carbon bonds. (Amino acids are linked by peptide bonds, which are formed between the carboxyl group of one amino acid and the amino group of another, not directly carbon-carbon bonds.)
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