Proteins are involved with many different functions inside of the cell. A student argues that because of this, proteins need to have a wide variety of structures Which of the following statements about proteins BEST supports the student's argument?
O A Proteins can be made up of any combination of 20 different amino acids
OB. Proteins are made up of individual units that form polypeptide chains
OC Proteins are composed of both essential and nonessential amino acids
OD Proteins are synthesized from RNA sequences containing four bases