which statement is true?

Question

amino acids form a polypeptide chain via carbon-carbon bonds.
amino acids do not need to be assembles in a particular order.
tRNA is attached to be specific proteins in the cells cytoplasm.
the human body uses 20 amino acids to form all types of proteins.

Answer 1

The true statement is: the human body uses 20 amino acids to form all types of proteins.

Here’s a brief explanation of the other statements to clarify why they are not true:

1. Amino acids form a polypeptide chain via carbon-carbon bonds.

   • Amino acids form polypeptide chains via peptide bonds, which are formed between the carboxyl group of one amino acid and the amino group of another, not carbon-carbon bonds.

2. Amino acids do not need to be assembled in a particular order.

   • This is false; the sequence of amino acids in a protein (the primary structure) is crucial because it determines the protein's structure and function.

3. tRNA is attached to be specific proteins in the cells cytoplasm.

   • This statement is misleading. tRNA is not attached to proteins; rather, it carries specific amino acids to the ribosome during protein synthesis and ensures that the correct amino acids are added in the proper sequence dictated by the mRNA.