Inactive precursors to enzymes are called: a. Zymogen b. Apoenzyme c. Cofactor d. Isozymes
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Inactive precursors to enzymes are called:
a. Zymogen
b. Apoenzyme
c. Cofactor
d. Isozymes
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- ________ are always changed by participating in a reaction. a. Enzymes c. Reactants b. Cofactors d. Coenzymes________ is a regulatory mechanism in which the end product of a metabolic pathway inhibits an enzyme that catalyzes an early step in the pathway. a. Cooperative inhibition b. Feedback inhibition c. Allosteric inhibition d. Non-competitive inhibition e. Metabolic inhibitionWhat is a regulatory mechanism in which a reaction product slows or stops a metabolic pathway that produces it? A. Phosphorylation B. Feedback inhibition C. Electron transfer chain D. Coenzyme
- How does an enzyme affect a chemical reaction? Select all that apply. A. Lowers the activation energy B. Decreases the rate of the reaction C. Increases the activation energy D. Increases the rate of the reactionThe mechanism in which the end product of a metabolic pathway inhibits an either step in the pathway is known as A. Reversible inhibition B. Metabolic inhibition C. Feedback inhibition D. Allosteric inhibition E. Noncoopetative inhibitionWhat is the active site of an enzyme? A. Specific molecule that acts as the reactant in an enzyme-mediated reaction B. An ion or nonprotein organic molecule that associates with an enzyme and is necessary for its function C. The part of an enzyme where substrates bind and a reaction occurs D. A specific ion or molecule that binds to an enzyme to enhance or inhibit its activity
- What roles do enzymes play in nature? Group of answer choices A.They have a role in metabolic reactions B. They increase rates of reaction but do not shift the equilibrium formed between products and reactants C. They catalyze cellular processes D. All of the aboveFactors that affect the activity of an enzyme molecule includea. the potential energy stored in the reactant molecules.b. size of the cell.c. temperature and pH.d. entropyWhich of the following is not true about enzymes?a. They are consumed by the reactions they catalyze.b. They are usually made of amino acids.c. They lower the activation energy of chemical reactions.d. Each one is specific to the particular substrate(s) to which it binds.
- Why is an enzyme considered "specific"? A. Only one type of enzyme is found in our bodies B. Only certain enzymes can pass through the cell membrane C. Its active site must match the substrate to do its job D. The enzyme can only move from high to low concentrationWhich of the following is NOT a means of regulating enzyme activity? a. zymogen storage b. isoenzyme feedback c. enzyme induction d. allosteric controlFor reactions to occur there needs to be what level of substrate and enzyme concentrations? Select one: a. Greater amount of substrate b. Lower amount of substrate c. Just the right amount of substrate