によって yoshe watson 16年前.
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YOSHE-Biology - Animal Survival-the need for food
Animals and plants have essential needs for survival, particularly the necessity for food, which provides energy and raw materials for growth. Carbohydrates, fats, and proteins are the main chemical components of food.
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Biology - Animal Survival(the need for food) chemical structure of food types proteins basic units they are built from-amino acids elements present-carbon, oxygen, hydrogen, nitrogen fats basic units they are built from-fatty acids and glycerol carbohydrates basic units they are built from-glucose molecules elements present-carbon, oxygen, hydrogen chemical tests for starch 2/ solution will turn blue/black if starch is present 1/ add 2 drops of brown iodine solution to food solution for glucose 3/ if glucose is present, an orange precipitate will form 2/ heat in a water bath until it boils 1/ add a few drops of blue benedicts solution to food solution main chemicals in foods fats-store energy, insulation, make cell membranes proteins-growth and repair carbohydrates eg sugar and starch-provide energy how organisms obtain their food animals-eat plants or other animals plants-make their own food by photosynthesis why we need food-a source of raw materials for growth and as a source of energy.
