BIO 203 Lecture 22: Lecture 22_ Digestion
18 Aug 2018
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Document Summary
Plants have roots, allows them to take up nutrients. Chemical energy organic precursors essential nutrients dietary (produce water through the breakdown of their food; ex. Unequal amounts of energy produced by different molecules. Calorie = energy required to raise 1 ml of water. Made up of glycerol + fatty acid. Saturated (stearic acid; ex. butter) and unsaturated fats (cis double bond causes bending; ex. Steroids are lipid-related molecules whose structure includes four linked carbon rings. Cholesterol is the primary source of steroids in the human body. All living cells store glucose for energy in the form of a polysaccharide. Linkage between two amino acids is known as a peptide bond. Large chains of proteins fold up in globes. Ingested amino acids > other amino acids > proteins for almost every cellular function. Fatty acids + glycerol > membrane phospholipids. Substances the body is unable to synthesize from organic precursors. Malnutrition: state of insufficiency of an essential nutrient.
