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Kaplan Qbank USMLE



Author8 Posts
  #1

The destruction of H2O2, which is a mildly toxic reduced oxygen species, is catalyzed by which of the following enzymes?

A) Nitric oxide synthase (inducible)

B) Cytochrome oxidase

C) Superoxide dismutase

D) Xanthine oxidase

E) Catalase

  #2

catalase

  #3

catalase

___________________
I hear and I forget. I see and I remember. I do and I understand.
--Confucius

  #4

yes right.......catalase.
H2O2 is neutralized by catalase ( located in peroxisomes ) and glutathione peroxidase.

  #5

Myeloperoxidase, too. Correct?

___________________
La vita e bella!

  #6

myeloperoxidase converts H2O2 to HOCl-. (reacts with Cl-) which is more toxic
catalase converts H2O2 to H2O and 1/2 O2

___________________
I hear and I forget. I see and I remember. I do and I understand.
--Confucius

  #7

Got u!
HOCl- is the bleach that kills the bacteria, correct?

___________________
La vita e bella!

  #8

right

___________________
I hear and I forget. I see and I remember. I do and I understand.
--Confucius







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