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Quiz 5

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MDCAT Practice Test - Practice Test - Biology - Enzymes Quiz

Attempt 10 MCQs on MDCAT Practice Test - Practice Test - Biology - Enzymes | Quiz 5

41. Which post-translational modification commonly regulates enzyme activity?

Phosphorylation
Acetylation
Ubiquitination
Methylation

42. What mechanism irreversibly activates zymogens?

Proteolytic activation
Phosphorylation
Allosteric regulation
Feedback inhibition

43. What is the Michaelis-Menten equation?

v = (Vmax [S]) / (Km + [S])
v = Vmax [S]
v = Vmax / [S]
v = Km [S]

44. What parameter indicates an enzyme's catalytic efficiency?

Kcat/Km
Km/Kcat
Vmax/Km
Kcat * Km

45. Which enzyme has an extremely high turnover number?

Carbonic anhydrase
Catalase
Aldolase
DNA polymerase

46. Which enzyme rapidly breaks down hydrogen peroxide?

Catalase
Peroxidase
Superoxide dismutase
Glutathione peroxidase

47. What are characteristics of DNA polymerase?

Primer requirement
3'→5' exonuclease proofreading
Polymerase activity
All of these

48. Does RNA polymerase require a primer?

Primer requirement
Proofreading
Both
Neither

49. Which enzymes cut DNA at specific palindromic sequences?

Restriction enzymes
DNA ligase
Reverse transcriptase
Taq polymerase

50. Which DNA polymerase is commonly used in PCR?

Taq polymerase
Pfu polymerase
Vent polymerase
Klenow fragment

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