BIOLOGY 2B03 Chapter Notes -Electrophoresis, Centrifugation
9 Feb 2012
School
Department
Course
Professor
Document Summary
3d structure dependent on 1) variation in lengths and a. a. sequences. 2) differences in number of disulphide bridges/or attachment of small molecules or ions to their a. a. side chains. Functions: structural proteins determine shape of cells. Acts as rails to direct movement of molecules: enzymes catalyze metabolic reactions, membrane transport permit the flow of ions/molecules across cellular membrane, regulatory act as communication signals. Sensors and switches: signaling proteins hormones and cell-surface receptors (transmit extracellular signals to cell interior, motor proteins moves other proteins, organelles, cell, and whole organisms. Proteins can have 2 functions at the same time. Cell-signaling receptors = both and enzyme and regulatory protein. By catalyzing chemical reactions, they transmit a signal. Proteins = bind to other macromolecules, dna and small ions/molecules. Enzyme catalysis appropriate folding of a protein will permit the catalysis of covalent bonds. Third activity involves folding into a channel through which ions can flow. Proteins part list possible through human genome sequencing.
