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  Ques: what are carbohydrates? describe its structure. Definition : Carbohydrates are one of the fundamental macronutrients that play a pivotal role in providing energy for the human body, alongside proteins and fats. carbohydrates are complex molecules composed of carbon, hydrogen, and oxygen. They come in simple forms, known as monosaccharides, and complex forms, like starch and cellulose. They serve as the body's primary source of energy, supplying the fuel required for various bodily functions and activities. Carbohydrates play a vital role in providing energy for daily activities and should be a significant part of a healthy diet, obtained from a variety of food sources.   Composition : Carbohydrates are composed of three essential elements: carbon, hydrogen, and oxygen. These elements combine in specific ratios to form sugar molecules, the basic building blocks of carbohydrates.   Basic Unit - Monosaccharides : The smal