Vitamin and Minerals Quiz

Vitamins A (specifically beta-carotene), C, and E are primary antioxidant vitamins that protect cells from damage caused by free radicals. They work together in different cellular environments to neutralize oxidative stress.

Fluoride is a mineral that strengthens tooth enamel, making it more resistant to acid attacks from plaque bacteria and sugars, thereby preventing dental cavities. It is commonly added to public water supplies and toothpaste.

Vitamin D is synthesized in the skin when it is exposed to ultraviolet B (UVB) radiation from sunlight. For this reason, it is often referred to as the sunshine vitamin.

Vitamin C (ascorbic acid) enhances the absorption of non-heme iron (the type of iron found in plant foods) by converting it into a more soluble chemical form in the digestive tract. Calcium in milk can actually inhibit iron absorption, making option A incorrect.

Bananas, oranges, and potatoes are well-known for their exceptionally high potassium content. While other fruits and vegetables contain some potassium, these foods are among the richest dietary sources.

Iodine is a key component of thyroid hormones. A deficiency in iodine prevents the thyroid gland from producing enough hormones, leading to its enlargement, a condition known as a goitre (or goiter).

Vitamin K is essential for the synthesis of proteins required for blood coagulation. A deficiency in vitamin K impairs the clotting process, leading to excessive bleeding. Acidosis is unrelated to vitamin K levels, and a deficiency would prevent blood clots rather than cause them.

Vitamins are essential organic micronutrients that the body needs in small amounts for proper growth, development, and metabolic function. Unlike macronutrients like carbohydrates and fats, vitamins do not directly provide the body with energy.

Ascorbic acid is the chemical name for Vitamin C, which is highly abundant in citrus fruits like oranges, lemons, and grapefruits. While some vegetables also contain Vitamin C, citrus fruits are classically known as excellent sources.

Vitamins are classified based on their solubility. They are either water-soluble (such as B-complex vitamins and Vitamin C) or fat-soluble (Vitamins A, D, E, and K).

Vitamin A is essential for maintaining good vision because it is a precursor of rhodopsin, the photopigment found in the retina that helps us see in low-light conditions. Deficiencies in Vitamin A can lead to night blindness.

Water-soluble vitamins include the B-complex vitamins and Vitamin C. Vitamins A, D, E, and K are fat-soluble and are stored in the body's fatty tissues.

Vitamin C (ascorbic acid) acts as a cofactor for the enzymes prolyl hydroxylase and lysyl hydroxylase, which are essential for stabilizing the collagen triple helix structure. Without it, collagen synthesis is impaired, leading to scurvy.

The term "vitamin" was coined by Polish biochemist Casimir Funk in 1912, who combined "vital" (essential for life) and "amine" because he mistakenly believed all these organic substances contained nitrogen.

Vitamin D plays a crucial role in maintaining bone health by promoting the absorption of calcium and phosphorus in the intestines. While it has other immune functions, its primary role is regulating calcium levels.

Citrus fruits, such as oranges, lemons, and limes, are highly concentrated and widely recognized dietary sources of Vitamin C. While some vegetables also contain Vitamin C, meats and eggs contain negligible amounts.

Vitamins A, D, E, and K are fat-soluble, meaning they are absorbed along with fats in the diet and stored in the body's fatty tissue. Other vitamins, like Vitamin C and the B-complex group, are water-soluble.

Vitamins are organic substances, meaning they are made by plants or animals. Minerals are inorganic elements that originate from the soil, water, or earth and are absorbed by plants or consumed by animals.