BIO152H5 Chapter Notes - Chapter 3: Protein Folding, Allosteric Regulation, Covalent Bond
Document Summary
In cells, most proteins are enzymes that function as catalysts. The diverse functions of proteins include: defense, movement, catalysis, signaling, structure, and transport. Defense destruction of disease causing viruses and bacteria. Act as signals that help coordinate the activities of many cells. Receive chemical signals from outside cell and initiate response. Provide support for cells and tissues; form structures such as hair, feathers, cocoons, and spider webs. Move substances across cell membrane; substances throughout body. To find out, stanley miller combined methane (ch4), ammonia (nh3), and hydrogen (h2) in a closed system with water, and applied heat and electricity as an energy source. The products included hydrogen cyanide (hcn) and formaldehyde (h2co), important precursors for more-complex organic molecules and amino acids. In more recent experiments, amino acids and other organic molecules have been found to form easily under these conditions. All proteins are made from just 21 amino acids.
