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Generally, when the temperature is very cold and the snow is hard, skiers use a hard wax to make the ski base more resistant to the sharp ice crystals. In wet snow, they use a softer wax to repel the melt water generated from the skis. Otherwise, the melt water would stick to the skis, like a glass of water sticks to a glass table, and force the skier to waste energy by working harder, with the result being the loss of an Olympic ­medal. 4 The basic chemical structure of a steroid is made of three six-carbon rings and one five-carbon ­ring.

This is why the body stores fat as an energy source. When the body needs extra energy, it breaks down the stored fat. When energy from food is not needed by the body, then it is stored as fat, and when too much fat gets stored, the person becomes ­overweight. Phospholipids Phospholipids are like triglycerides, but they have two fatty acid chains called “tails” and one charged group called the “head” that contains phosphate and oxygen atoms. Because it is charged, the head is polar and therefore attracts water ­molecules.

2 Amylose is a type of starch found in long grain ­rice. Starch Starch is made up of long chains of glucose molecules, and it is not soluble in ­water. Plants and some algae store food in the form of starch. In plants, starch is mainly found in seeds, roots, and tubers as well as in stems, leaves, fruits, and even pollen. Grain seeds, such as corn kernels, contain up to 75% starch. Therefore, it is an important component of the carbohydrates in the diet and a very good source of energy for the body.

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