PPT-Enzymes 2.5: Enzymes control the metabolic reactions of the cell

Enzyme amp Substrate An enzyme is a globular protein which acts as a biological catalyst by speeding up the rate of chemical reactions Enzymes are NOT changed or consumed by the reactions they catalyze and thus can be reused . Chapter 2: Section 2.5. 1. Objectives. SWBAT explain the effect of a catalyst on activation energy. . SWBAT describe how enzymes regulate chemical reactions. . and maintain homeostasis.. 2. Starter: How can this be possible. A catalyst is a chemical agent that speeds up a reaction without being consumed by the reaction. An enzyme is a catalytic protein. Hydrolysis of sucrose by the enzyme sucrase is an example of an enzyme-catalyzed reaction. The problem to be solved (an example). Hauf, J., Zimmermann, F.K., M. ü. ller, S., 2000. Simultaneous genomic over expression of seven glycolytic enzymes in the yeast Saccharomyces cerevisiae. Ezyme. Microbiol. Technol.. Enzymes speed up chemical reactions.. Everything that happens in a cell. Growth. Reproduction. Interaction with the environment. Response to stimuli. Is the result of a chemical reaction.. A chemical reaction is a change in the arrangement. What you should learn:-. The difference between . Anabolic. and . Catabolic. metabolic pathways, and give examples of each.. The importance of . reversible, irreversible . and . alternative. pathways in the control of metabolism.. 1. What are enzymes?. Each enzyme has only one specific reaction it can perform. . 2. How many different reactions can a single enzyme perform?. Yes, the same enzyme molecule can be used over and over. protein. !. Enzymes are . Biological . catalysts . that . increase. . the rate of metabolic reactions.. Since enzymes speed up chemical reaction rates, what are they called?. Catalyst- . A substance . Part 1. . Chapter 3. Learning outcomes. You should be able to:. explain how enzymes work. describe and explain the factors that affect. enzyme activity. use V. max. and K. m. to compare the affinity of different enzymes for their substrates. Enzymes. Back when we discussed proteins, we learned that one critical function of protein was to speed up chemical reactions.. Enzymes. are the proteins that increase the rate of chemical reactions. In order for chemical reactions to take place, . enzymes . must be present to help . speed up . the reaction.. Chemical bonds connect atoms. to make . molecules. .. Chemical . reactions. can do two things:. Regulation of enzymes Introduction andProperties of Enzymes Enzymes are characteristics to facilitate the Enzyme-catalyzed reactions take place Reactants need to pass over the energy barrier, Catalys that . catalyze. (. i.e.. , . increase or decrease the rates. of) . chemical reactions. .. . In enzymatic reactions, the . molecules. at the beginning of the process are called . substrates. , and they are converted into different molecules, called the . enzymes. . . The . substance converted by an enzyme is called a . substrate. , and a substance resulting from the conversion of the substrate is called the . product. . . The . enzyme is not consumed during the reaction catalyzed by it, so one enzyme molecule is involved in the conversion of many substrate molecules . Metabolic Control Mechanisms . Anadozie, S.O Ph.D.. Metabolic Control Mechanisms . The metabolic pathways are complex and interdependent. With the changing . environments, . the reactions of metabolism must be finely regulated to maintain a constant set of conditions within cells, a condition called homeostasis..