Oxygen Toxicity and Free Radicals Practice Questions

Question 1

Which vitamin is considered the most potent antioxidant?

Accepted Answer

Vit E

Answer

Vit A

Answer

Vit K

Answer

Vit C

Question 2

Which of the following does not protect red blood cells from free radical damage?

Accepted Answer

Glutamine

Answer

Catalase

Answer

Glutathione

Answer

Superoxide dismutase

Question 3

Glutathione does all of the following except?

Accepted Answer

Decreases the stability of erythrocyte membranes

Answer

Scavenge peroxides

Answer

Form conjugates with some drugs to increase water solubility

Answer

Participates in the transport of amino acids across some cell membranes

Question 4

Which of the following is not an antioxidant?

Accepted Answer

Iron

Answer

Enzymes like glutathione peroxidase, superoxide dismutase

Answer

Vitamins like C and E

Answer

Hormones like insulin, cortisol

Question 5

Oxygen dependent killing is done through

Accepted Answer

NADPH oxidase

Answer

Superoxide dismutase

Answer

Glutathione peroxidase

Answer

Catalase

Question 6

All are sources of free radicals except -

Accepted Answer

Glutathione

Answer

Nitric oxide

Answer

Myeloperoxidase

Answer

Fenton's reaction

Question 7

Type IV complex of ETC is inhibited by

Accepted Answer

Cyanide

Answer

Antimycin

Answer

Oligomycin

Answer

CO2

Question 8

Which of the following anesthetic agents is NOT hepatotoxic?

Accepted Answer

Propofol

Answer

Ether

Answer

Halothane

Answer

Chloroform

Question 9

Cancer cells preferentially utilize glycolysis for energy production even in the presence of adequate oxygen. What is this phenomenon called?

Accepted Answer

Warburg effect

Answer

Hypoxic adaptation

Answer

Anoxic survival

Answer

Oxygen-independent metabolism

Question 10

How does cyanide inhibit the electron transport chain?

Accepted Answer

Inhibits complex IV

Answer

Inhibits complex III (cytochrome bc1 complex)

Answer

Directly inhibits ATP synthase

Answer

Inhibits complex I (NADH dehydrogenase)

Oxygen Toxicity and Free Radicals — MCQs

Oxygen Toxicity and Free Radicals — MCQs

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