The true statement is:
The human body uses 20 amino acids to form all types of proteins.
This statement is accurate because humans utilize 20 standard amino acids to synthesize all proteins necessary for various biological functions. Each protein is made up of specific sequences of these amino acids.
The other statements are incorrect for the following reasons:
- Amino acids do not need to be assembled in a particular order. (Incorrect: The specific order of amino acids is crucial for the function and structure of the resulting protein.)
- Amino acids form a polypeptide chain via carbon-carbon bonds. (Incorrect: Amino acids are linked by peptide bonds, which are formed between the carboxyl group of one amino acid and the amino group of another.)
- tRNA is attached to specific proteins in the cell’s cytoplasm. (Incorrect: tRNA carries amino acids to the ribosome during protein synthesis, but it does not attach to proteins; it pairs with mRNA codons.)
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