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Selenium in Plants and Soil

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Questions and Answers

What is the primary role of CYP3A4 and CYP3A5 in the intestines and liver?

Systemic clearance and first-pass metabolism of gefitinib (correct)

Detoxification by minimizing the toxic action of heavy metals

Induction of herbal medicines, leading to a decrease in gefitinib concentrations

Antioxidant properties, protecting cells from deformation

What is the effect of selenium deficiency on the body?

Immune system stimulatory properties

Increased excretion of organic and inorganic forms of arsenic

Reduced accumulation of arsenic in the liver and prevention of skin disorders

Accumulation of arsenic in the liver and skin, lung, and heart disorders (correct)

What is the recommended dose of selenium for adults?

One tablet up to three times daily, preferably with meals

Two tablets up to three times daily, preferably with snacks

Two tablets up to two times daily, preferably with breakfast

One tablet up to two times daily, preferably with meals (correct)

Why is selenium particularly important for patients with renal diseases?

Due to lower plasma selenium levels and glutathione peroxidase activity Signup and view all the answers

What is the effect of selenium on the fetus during pregnancy?

It crosses the placental barrier, entering the fetus Signup and view all the answers

What is one of the mechanisms by which selenium acts as a detoxifying agent?

By minimizing the toxic action of heavy metals Signup and view all the answers

In what form does selenium mainly exist in plants?

Organic form Signup and view all the answers

What can reduce selenium bioavailability to plants?

All of the above Signup and view all the answers

What is the main product of selenium conversion in cereals and forage crops?

Selenomethionine (SeMet) Signup and view all the answers

How do antioxidants neutralize free radicals?

By accepting or donating electrons Signup and view all the answers

What happens to antioxidants after they react with free radicals?

They are terminated by other mechanisms Signup and view all the answers

What is the main function of selenium yeast?

To incorporate selenium into protein in competition with methionine Signup and view all the answers