22 Biology -- Biomolecules

1. Which of the following vitamins cannot be produced by our body?(a) vitamin A(b) vitamin K(c) vitamin C(d) All of the above Ans: (d) All of the above.

1. Which of the following vitamins cannot be produced by our body?

(a) vitamin A

(b) vitamin K

(c) vitamin C

(d) All of the above 

Ans: (d) All of the above.

Vitamin C, also known as ascorbic acid, is a water-soluble vitamin that cannot be produced by the human body, which means it must be obtained from dietary sources. Vitamin C is essential for a wide range of biological functions, including collagen synthesis, wound healing, iron absorption, and immune system function.

Although most animals can synthesize their own vitamin C, humans and other primates lack the necessary enzyme L-gulonolactone oxidase, which is required for the synthesis of vitamin C from glucose. Therefore, humans must obtain vitamin C from dietary sources, such as citrus fruits, berries, kiwi, tomatoes, peppers, leafy greens, and other fruits and vegetables.

A deficiency in vitamin C can lead to a variety of health problems, including scurvy, a disease characterized by fatigue, muscle weakness, joint and muscle aches, and bleeding gums. Scurvy was once a common condition among sailors who were at sea for long periods without access to fresh fruits and vegetables containing vitamin C.

To prevent vitamin C deficiency, it is important to consume a diet that is rich in vitamin C-containing foods or to take vitamin C supplements if necessary. The recommended daily intake of vitamin C for adults is around 75 to 90 mg per day, but higher doses may be necessary for certain individuals, such as smokers, pregnant women, and those with certain medical conditions.

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