If an Amino Acid Involved in the Ability of an Enzyme

question 158

Multiple Choice

If an amino acid involved in the ability of an enzyme to bind a substrate were changed from a tyrosine to a phenylalanine, what would happen to the enzyme?

• A) Nothing would change, because both residues have the same properties.
• B) The change in amino acid would cause disulfide bonds to form, thus increasing its binding ability.
• C) Nothing would change, because both residues have polar side chains.
• D) Quaternary structure would be affected, because subunits would not be able to bind together.
• E) The ability of the substrate to bind to the enzyme would be affected because of the change in R groups.

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