All of the following are free radical scavengers except
**Question:** All of the following are free radical scavengers except
A. Vitamin E
B. Vitamin C
C. Coenzyme Q10
D. Superoxide dismutase
**Core Concept:**
Free radicals are highly reactive molecules that can damage cellular components, leading to various diseases. To counteract the harmful effects of free radicals, the body relies on endogenous (native) and exogenous (supplemented) antioxidants. Endogenous antioxidants include enzymes like superoxide dismutase (SOD), catalase, and glutathione peroxidase. Exogenous antioxidants include vitamins (Vitamin E, Vitamin C, etc.) and other molecules (Coenzyme Q10).
**Why the Correct Answer is Right:**
Superoxide dismutase (SOD) is a crucial enzyme that neutralizes superoxide anions, a type of free radical, into less harmful molecules. The other options are antioxidants that can directly scavenge free radicals or enhance the activity of other antioxidants.
**Why Each Wrong Option is Incorrect:**
A. Vitamin E is a fat-soluble antioxidant that scavenges various free radicals, including lipid peroxyl radicals.
B. Vitamin C is a water-soluble antioxidant that neutralizes various free radicals, such as hydroxyl and hydrogen peroxide radicals.
C. Coenzyme Q10 is a lipid-soluble antioxidant that directly neutralizes free radicals and enhances the activity of other antioxidants, including Vitamin E.
**Clinical Pearl:**
Coenzyme Q10, also known as ubiquinone, is an essential component of the electron transport chain in mitochondria, helping generate ATP (adenosine triphosphate) and reducing reactive oxygen species (ROS) production. This makes it an effective antioxidant with a broad range of pharmacological applications.
**Correct Answer:** C (Coenzyme Q10)
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In summary, while Vitamin E and Vitamin C directly neutralize free radicals, Superoxide Dismutase (SOD) and Coenzyme Q10 indirectly enhance the antioxidant defense system by inhibiting the production of reactive oxygen species (ROS) or increasing the activity of other antioxidants, including Vitamin E. Coenzyme Q10 stands out as the correct answer because it directly neutralizes free radicals and enhances the activity of other antioxidants, including Vitamin E.
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