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Chapter 16: Q. 16.41 (page 571)
A patient arrives in an emergency department complaining of chest pains. What enzymes would you test for in the blood serum?
amounts in blood serum typically higher after one heart attack.
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Methanol and ethanol are oxidized by alcohol dehydrogenase. In methanol poisoning, ethanol is given intravenously to prevent the formation of formaldehyde that has toxic effects.
a. Draw the condensed structural formulas for methanol and ethanol.
b. Would ethanol compete for the active site or bind to a different site?
c. Would ethanol be a competitive or noncompetitive inhibitor of alcohol dehydrogenase?
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?
What functional groups are found in all a-amino acids?
Classify each of the amino acids in the problem as polar or nonpolar. If polar, indicate if the R group is neutral, acidic, or basic. Indicate if each is hydrophobic or hydrophilic.
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?
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