Exercise: Enzymes

Questions for: Enzymes

How is the enzyme COX-1 important in human health?
A:
It helps to transport carbon dioxide in the blood
B:
It is critical for the biosynthesis of DNA
C:
It is a chemical derivative of aspirin
D:
It catalyzes the production of hormones that maintain the stomach lining
Answer: D
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Common feature in all serine proteases is a
A:
hydrophobic specificity pocket
B:
hydrophilic specificity pocket
C:
cluster of reactive serine residues
D:
single reactive serine residue
Answer: D
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Before they can react, many molecules need to be destabilized. This state is typically achieved through
A:
changing the three-dimensional shape of the molecule
B:
oxidizing the molecules by removing electrons
C:
changing the reaction from a biosynthetic to a catabolic pathway
D:
the input of a small amount of activation energy
Answer: D
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Which of the common features are shared between serine and aspartate proteases?
A:
Both require water to complete the catalytic cycle
B:
Both use a base to activate the nucleophile
C:
Both show specificity for certain amino acid sequences
D:
All of the above
Answer: D
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The E.coli pyruvic acid dehydrogenase complex is reported to
A:
decatalyze the oxidation of pyruvic acid to acetyl Co A and CO2
B:
Catalyze the oxidation of pyruvic acid to acetyl Co A and CO2
C:
retard the reduction of pyruvic acid to acetyl Co A and CO2
D:
Catalyze the reduction of pyruvic acid to acetyl Co A and CO2
Answer: B
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