The carbon-nitrogen peptide bond is rigid, but rotation can take place about the N-Ca and the Ca-C bonds in a protein (Ca is the a carbon atom). These bond angles define the conformation of the peptide chain. Consider the Ramachandran plot to answer both questions. Which dihedral angles and residues would not likely occur in a ß sheet? 180 120 60 -60 -120 -180 -180 180 o (degrees) O=-51°; Q=+153°; many Gly and Pro residues OA. O B. D=+60°; Y=+60°; many Gly residues OC. ®=-57"; y-49°; many Ala residues OD. D=-139°; =+135°; many Val residues O=-120°; y-+120°; many Tyr residues (səəBəp)

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Metabolic pathways

Metabolism is defined as the group of life-supporting, enzyme-mediated chemical reactions in organisms. A metabolic pathway is a set of these chemical reactions that involve anabolism (synthesis of complex biomolecules) and catabolism (breakdown of biomolecules into small molecules) that occur inside a cell. Metabolites are the reacting substances, products, and intermediate substances of an enzymatic process that are altered by a series of chemical events catalyzed by enzymes.