Even though human proteins are synthesized from only 20 different amino acids, there are thousands of different proteins found in human cells. This great variety of proteins is possible because the
(1) size of a specific amino acid can vary within a protein
(2) chemical composition of a specific amino acid can vary
(3) sequence and number of amino acids can be different in each protein
(4) same amino acid can have many different properties
Answer and explanation:
How are proteins made in our body? Proteins are synthesized from amino acids which are like the letters of an alphabet. And even though our alphabet is only 26 letters, how many words do we have? Hundreds of thousands.
Therefore, choice 3 is correct, sequence and number of amino acids can be different in each protein.
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