Free radicals
A. are not a byproduct of metabolism.
B. can only form in the presence of oxygen.
C. may arise by absorption of radiant energy.
D. are removed with the aid of Vitamin A derivatives.
E. contain an extra protein that may bind to and destroy organic molecules
The correct answer is C. may arise by absorption of radiant energy.
Free radicals are highly reactive molecules that contain an unpaired electron, making them highly reactive. They can arise from various sources, including:
– Metabolic byproducts (e.g., during oxidative phosphorylation)
– Absorption of radiant energy (e.g., UV radiation, X-rays)
– Environmental factors (e.g., air pollution, cigarette smok