Which statement is true? (1 point)
A. • Amino acids do not need to be assembled in a particular order.
B. • Amino acids form a polypeptide chain via carbon-carbon bonds.
C. • The human body uses 20 amino acids to form all types of proteins.
D. • tRNA is attached to specific proteins in the cell's cytoplasm.
C. The human body uses 20 amino acids to form all types of proteins.
To determine which statement is true, let's analyze each statement and eliminate options that are incorrect.
A. Amino acids do not need to be assembled in a particular order.
This statement is false because amino acids do need to be assembled in a specific order to form proteins. The order of amino acids determines the structure and function of the protein.
B. Amino acids form a polypeptide chain via carbon-carbon bonds.
This statement is false because amino acids form a polypeptide chain via peptide bonds, not carbon-carbon bonds. Peptide bonds are formed between the carboxyl group of one amino acid and the amino group of another amino acid.
C. The human body uses 20 amino acids to form all types of proteins.
This statement is true. The human body utilizes 20 different amino acids to create various types of proteins. These amino acids are called proteinogenic amino acids.
D. tRNA is attached to specific proteins in the cell's cytoplasm.
This statement is false. tRNA (transfer RNA) is not attached to proteins but carries specific amino acids and binds them to the ribosomes during protein synthesis.
Based on the analysis above, the statement that is true is:
C. The human body uses 20 amino acids to form all types of proteins.