Podcast
Questions and Answers
What is the main biochemical role of vitamin K?
What is the main biochemical role of vitamin K?
- Cofactor for carboxylation of glutamic acid residues in proteins involved in blood coagulation (correct)
- Regulation of senescence and malignant transformations
- Activation of tocopherols as antioxidants
- Prevention of atherosclerosis
Which source is the most rich in tocopherols?
Which source is the most rich in tocopherols?
- Liver
- Seeds
- Eggs
- Vegetable oils (correct)
How do tocopheroxyl radicals get regenerated under antioxidant action?
How do tocopheroxyl radicals get regenerated under antioxidant action?
- They react with oxygen
- Other molecules with antioxidant capacity can regenerate them (correct)
- They combine with glutamic acid residues
- They are eliminated from the body
What is the recommended daily allowance (RDA) for alpha-tocopherol in adults?
What is the recommended daily allowance (RDA) for alpha-tocopherol in adults?
Which of the following is NOT a form of vitamin K?
Which of the following is NOT a form of vitamin K?
What happens to the requirement for tocopherols as the intake of polyunsaturated fatty acids increases?
What happens to the requirement for tocopherols as the intake of polyunsaturated fatty acids increases?
What is the main biochemical role of vitamin E in the body?
What is the main biochemical role of vitamin E in the body?
Which of the following is a tocopherol compound of vitamin E?
Which of the following is a tocopherol compound of vitamin E?
What can happen if there is a deficiency in vitamin E?
What can happen if there is a deficiency in vitamin E?
How is vitamin D different from vitamin E in terms of storage and metabolism?
How is vitamin D different from vitamin E in terms of storage and metabolism?
Which type of compounds are tocotrienols in vitamin E?
Which type of compounds are tocotrienols in vitamin E?
What harmful effect can excess vitamin D intake have on the body?
What harmful effect can excess vitamin D intake have on the body?
What is the enzyme present in the human intestine that can cleave β-carotene into two molecules of retinal?
What is the enzyme present in the human intestine that can cleave β-carotene into two molecules of retinal?
What is the efficiency of the conversion of β-carotene into retinal compared to retinol?
What is the efficiency of the conversion of β-carotene into retinal compared to retinol?
In which part of the molecule does the cleavage of β-carotene to retinal occur?
In which part of the molecule does the cleavage of β-carotene to retinal occur?
What is the active form derived from the oxidation of retinol?
What is the active form derived from the oxidation of retinol?
Which vitamin A form is essential in vision and exists as 11-cis retinal bound to protein opsin in rod cells of the retina?
Which vitamin A form is essential in vision and exists as 11-cis retinal bound to protein opsin in rod cells of the retina?
In rod cell outer segments, what happens to 11-cis retinal upon illumination?
In rod cell outer segments, what happens to 11-cis retinal upon illumination?
