MCDB 20 Lecture Notes - Lecture 9: Ovalbumin, Egg White, Neuron
4 Dec 2017
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Ex: digestive enzymes catalyze the hydrolysis of bonds in food molecules. Ex: antibodies inactivate and help destroy viruses and bacteria. Ex: casein, the protein of milk, is the major source of amino acids for baby mammals. Plants have storage proteins in their seeds; ovalbumin is the protein of egg white, used as an amino acid source for the developing embryo. Ex: hemoglobin, the iron-containing protein of vertebrate blood, transports oxygen from the lungs to other parts of the body; other proteins transport molecules across membranes. Ex: insulin, a hormone secreted by the pancreas, causes other tissues to take up glucose, thus regulating blood sugar concentration. Ex: receptors built into the membrane of a nerve cell detect signaling molecules released by other nerve cells. Ex: motor proteins are responsible for the undulations of cilia and flagella; actin and myosin proteins are responsible for the contraction of muscles.
