The true statement among the options provided is:
The human body uses 20 amino acids to form all types of proteins.
This statement is accurate because there are 20 standard amino acids that are used by cells to synthesize proteins, and the specific sequence of these amino acids determines the structure and function of the proteins produced.
The other statements are not correct:
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Amino acids form a polypeptide chain via carbon-carbon bonds: Amino acids are linked together by peptide bonds, which are formed between the carboxyl group of one amino acid and the amino group of another. These bonds are not carbon-carbon bonds.
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Amino acids do not need to be assembled in a particular order: This statement is false because the specific order in which amino acids are assembled (the primary structure of a protein) is critical for the correct function of the resulting protein.
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tRNA is attached to specific proteins in the cell's cytoplasm: This is misleading. tRNA (transfer RNA) molecules are involved in bringing amino acids to the ribosome during protein synthesis. It carries amino acids to the ribosome, but it does not get attached to proteins directly.
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