Which one of the following vitamins Is required for normal growth, vision, and keeping the skin healthy?
Correct answer: C. Vitamin A
- A. Vitamin D
- B. Vitamin E
- C. Vitamin A
- D. Vitamin K
Explanation
Vitamin A. Both the upper and lower layers of skin need vitamin A. It seems to prevent sun damage by interrupting the process that breaks down collagen. Since it's an antioxidant, it may give your skin some protection against sunburn (although not as much as wearing sunscreen).Vitamin A seems to help the growing tissues in a baby in the womb. It also helps the placenta form during pregnancy. Vitamin A is an important factor in growth throughout life. Vitamin A helps grow and maintain epithelial tissues.A group of antioxidants, vitamin A not only is beneficial to a healthy functioning ocular surface but also is required for the formation of the photoreceptor rhodopsin. This photopigment found in rod cells of the retina is especially helpful in allowing our eyes to see at night.
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Proteins are classified by shape, composition and structure, from primary amino acid sequence to secondary, tertiary and quaternary organisation, and their biological roles are linked to this structure. Enzymes are examined as protein biocatalysts, including active sites, substrate specificity, activation energy, cofactors and factors affecting activity.
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