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3.4, 8.1, 8.3, 8.4, B9 Book Notes.docx

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Department
Biology
Course Code
BIO-0013
Professor
Michelle Gaudette

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Sept 16, 2013 3.4 Proteins are crucial to most tasks required for cells to exist: • Catalysis – many proteins, known as enzymes, speed up chemical reactions; may be the  most important function due to speed • Defense – proteins called antibodies and complement proteins attack and destroy viruses  and bacteria that cause disease • Movement – motor proteins and contractile proteins are responsible for moving the cell  itself, or for moving large molecules and other types of cargo inside the cell; ex: actin and  myosin • Signaling – proteins are involved in carrying and receiving signals from cell to cell inside  the body • Structure – structural proteins make up body components such as fingernails and hair,  and define the shape of individual cells; structural proteins keep red blood cells flexible  and in their normal disc­like shape •
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