Which of these is a key characteristic of all enzymes?
BIOLOGY
SAT 2021
Which of these is a key characteristic of all enzymes?
- A. An enzyme reduces the amount of activation energy needed in a system for a certain chemical reaction to occur.
- B. An enzyme is not depleted in a reaction.
- C. An enzyme is a protein product, usually created from 2 or more polypeptide chains. The structure of the enzyme determines the function of the enzyme.
- D. All of these
Correct Answer: D. All of these
Explanation
These are all definitive traits of an enzyme. Enzymes are proteins which are extremely helpful in speeding up certain reactions without being depleted by the reactions themselves (as such, they are catalysts for these reactions). Enzymes reduce the amount of energy needed for a reaction to occur, generally because they facilitate reactions by recognizing reactants and bringing them into contact with each other. This occurs when the reactants bind to certain parts of the enzyme (active sites), which causes the enzyme to change shape and bring the reactants into contact with each other (and then the reactants can bind to form the product).
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