Vitamins questionsThis is a list of recently added questions about vitamins.
What vitamin deficiency causes pellagra?
Pellagra is a disease caused by a lack of niacin (vitamin B3). Symptoms include inflamed skin, diarrhea, dementia, and sores in the mouth. Areas of the skin exposed to either sunlight or friction are typically affected first. Over time, affected skin may become darker, stiff, begin to peel, or bleed.
Which of the following is not a branched-chain amino acid?
A branched-chain amino acid (BCAA) is an amino acid having aliphatic side-chains with a branch. Among the proteinogenic amino acids, there are three BCAAs: leucine, isoleucine and valine. They are among the nine essential amino acids for humans, accounting for 35% of the essential amino acids in muscle proteins and 40% of the preformed amino acids required by mammals.
Why did people from southern Asia commonly suffer from beriberi sickness in late 1800s?
eating toxic sea algae
drinking dirty water
eating mostly white rice
Beriberi is a sickness caused by extreme deficiency of vitamin B1, thiamine. White rice is generally a poor source of vitamins, and completely lacks thiamine. The sickness became common in Asia in 1800s with the increased processing of rice.
Which vitamin is produced in the skin during sun bathing?
Vitamin D is synthesized from cholesterol in the skin with the help of the natural ultraviolet wavelength of sunlight. Supplementation of vitamin D is recommended only for sun-deprived people (eg. elderly or living in the Far North).
What is the effect of nicotinic acid on human organism?
it is neutral
It is harmful, causes cancer
It is highly toxic, kills in 10 seconds
It is essential for functioning
Nicotinic acid, better known as niacin or vitamin B3, has nothing in common with tobacco. Chronic lack of niacin leads to pellagra, a vitamin deficiency disease.
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