Free radicals MCQ 12+

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Systems that operate to inactivate free radicals are

ক
Glutathione peroxidase

খ
Superoxide dismutase

গ
Vitamin C

ঘ
Hydrogen peroxide

ঙ
Myeloperoxidase
Free radicals are formed in the body

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By absorption of X-rays

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During metabolism

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By the formation of reactive oxygen species

ঘ
By superoxide dismutases

ঙ
By vitamin E
Reactive oxygen species are released

ক
During phagocytosis

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During regeneration of tissue

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During tumorigenesis

ঘ
On exposure to immune complexes

ঙ
On exposure to chemokines
Hydrogen peroxide can be neutralized by

ক
Catalase

খ
Glutathione peroxidase

গ
Superoxide dismutase

ঘ
Myeloperoxidase

ঙ
Glucose 6- phosphate dehydrogenase
Free radicals are generated

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During inflammation

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By enzymatic metabolism of drugs

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During normal metabolic processes

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By glutathione

ঙ
By ceruloplasmin
Free radicals are removed from the cells by the action of

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Superoxide dismutase

খ
Transferrin

গ
Glutathione

ঘ
Endonuclease

ঙ
Vitamin B12
Free radicals

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May arise by absorption of radiant energy

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Antioxidants block free radical formation

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May cause peroxidation of lipids within plasma membrane

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Are not a byproduct of metabolism

ঙ
Can only form in the presence of oxygen
Hydrogen peroxide can be neutralized in our body by

ক
Glutathione peroxidase

খ
Catalase

গ
Superoxide dismutase

ঘ
Myeloperoxidase

ঙ
Glucose 6-phosphate dehydrogenase (G6P
Removal of free radicals occur by

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Antioxidant

খ
Superoxide dismutase

গ
Transferrin

ঘ
Calcium

ঙ
Nitric Oxide
Antioxidants is/are

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Ascorbic acid

খ
Vitamin E

গ
Vitamin D

ঘ
Superoxide

ঙ
Hydrogen peroxide