Enzymes Flashcards
(15 cards)
What are enzymes?
Enzymes are biological catalysts that speed up chemical reactions in living organisms.
True or False: Enzymes are consumed in the reactions they catalyze.
False
Fill in the blank: Enzymes are typically _____ proteins.
globular
What is the active site of an enzyme?
The active site is the region on the enzyme where substrate molecules bind and undergo a chemical reaction.
What is the role of substrates in enzyme activity?
Substrates are the reactants that enzymes act upon to form products.
Which factor does NOT affect enzyme activity?
The color of the enzyme
What term describes the maximum rate of reaction at which an enzyme can catalyze a reaction?
Vmax
True or False: Enzyme activity can be affected by temperature.
True
What is an enzyme inhibitor?
An enzyme inhibitor is a substance that decreases or stops the activity of an enzyme.
What is the difference between competitive and non-competitive inhibition?
Competitive inhibition occurs when an inhibitor competes with the substrate for the active site, while non-competitive inhibition occurs when an inhibitor binds to a site other than the active site.
What is enzyme specificity?
Enzyme specificity refers to the ability of an enzyme to select and catalyze a specific substrate.
What are coenzymes?
Coenzymes are organic molecules that assist enzymes in catalyzing reactions.
Which of the following is NOT a factor affecting enzyme activity? a) pH b) Temperature c) Color d) Substrate concentration
c) Color
Fill in the blank: The _____ model describes how enzymes and substrates interact.
lock and key
What is the effect of pH on enzyme activity?
Each enzyme has an optimal pH range where its activity is maximized; deviations can reduce activity.
