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Enzymes & Metabolism
Exam 4 Study Guide
Question | Answer |
---|---|
What is "basal metabolic rate" (BMR)? | the energy needed to maintain metabolism at rest |
What is "metabolism"? | all chemical reactions that keeps organisms alive |
What is "anabolism"? | synthetic reaction that form covalent bonds |
What is "catabolism"? | metabolic reactions that break covalent bonds |
Which requires more energy- catabolic or anabolic reactions? | catabolic |
What is "activation energy"? | amount of energy needed for chemical reactions to process |
What forms of energy provide activation energy to chemical reactions? | temperature, high pressure, or some other form of energy |
What is a "catalyst"? | a chemical that speeds up chemical reactions by lowering activation energy |
What is an enzyme? | biological catalyst that lower the amount of energy needed for the reaction |
Why are enzymes called "biological catalysts"? | because they "facilitate" catabolic and anabolic reactions without being used in process and speeds up the chemical reactions in the body |
What effect do enzyes have on the activation energy of a chemical reaction? | enzymes lower activation energy |
What is meant by the "reactant(s)" in a chemical reaction? | elements that change into other elements (substances) |
What is meant by the "product(s)" from a chemical reaction? | what the reactant changes into |
What is the difference between anabolic and catabolic? | anabolic creates complex materials form simple substances while catabolic breaks down and processes buildup (anabolic) |
What is the enzyme's "substrate"? | the reactant that enzymes act on |
What is the enzyme's "active site"? | the region where substrate molecules bind and undergo chemical reaction |
How does enzyme catalyze a chemical reaction? | the enzymes shape changes |
How are enzymes named? | usually named for their substrate or the reaction they facilitate |
What biomolecule are most enzyme made of? | Protein |
Why is the shape of the enzyme so important? | because it determines a proteins function |
What kind of chemical bond helps hold together the 3-dimensional shape of the enzyme? | hydrogen bonds |
How does temperature and pH affect hydrogen bonding and therefore the shape of the enzyme? | hydrogen bonding is formed at normal temperature and pH but breaks apart at high temperatures and extremes of pH |
Why do Siamese cats have dark faces, ears, legs, and tail and a light colored body? | because of genetic mutation (DNA change) that result in heat sensitivity making pigment melanin |
How does high temperature or extreme pH affect the hydrogen bonding and the enzyme's shape? | high temperature can break hydrogen bond interactions in the protein and change the shape of the protein |
What does it mean when an enzyme is "denatured"? | when heat or chemical reactions render the enzyme inactive |
How does denaturation affect the protein's (enzyme's) function? | by breaking the hydrogen bond makes the protein unable to form |
What is the "biochemical pathway" and why are enzymes important to them? | a different enzyme is used at each step in the pathway so if the enzyme is missing, the chemical reaction won't happen |