MCAT Question of the Day
    •

    Q:

    		 All individual amino acids are soluble in water; however, not all peptides are soluble. Which of the following choices best explains this?
    		 

    A

    		 The R groups of the amino acid residues in the peptide are charged at physiological pHs

    B

    		 The R groups on all amino acids can interact noncovalently with water at pH = 7.4 (the pH of a normal, healthy body)

    C

    		 All peptides are insoluble in water

    D

    		 Individual amino acids are zwitterions at physiological pHs



    Protein Structure and Function | Acid/Base Equilibria |
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