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Chapter 16: Q. 16.29 (page 570)
Why do chemical reactions in the body require enzymes?
To meet the body's needs, the chemical reactions in our cells must occur at high rates.
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In myoglobin, about one-half of the 153 amino acids have nonpolar groups.
a. Where would you expect those amino acids to be located in the tertiary structure?
b. Where would you expect the polargroups to be in the tertiary structure?
c. Why is myoglobin more soluble in water than silk or wool?
Match the terms (1) enzyme-substrate complex, (2) enzyme, and (3) substrate with each of the following:
a. has a tertiary structure that recognizes the substrate
b. the combination of an enzyme with the substrate
c. has a structure that fits the active site of an enzyme
How do enzymes make chemical reactions in the body proceed at faster rates?
Fresh pineapple contains the enzyme bromelain that hydrolyzes peptide bonds in proteins.
a. The directions for a gelatin (protein) dessert say not to add fresh pineapple. However, canned pineapple where pineapple is heated to high temperatures can be added. Why?
b. Fresh pineapple is used in a marinade to tenderize tough meat. Why?
c. What structural level of a protein does the bromelain enzyme destroy?
Peprides isolated from rapeseed that may have limaer blond pressure have the following sequence of amino acids. Draw the structure for each peptide and write the one-letter abbreviations.
a. Arg-lle-Iyr
b. Val-Irp-lle-Ser
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