Enzymes

What are enzymes?

• Carbohydrates

• Catalysts

• Lipids

• Nucleic Acids

Enzymes are necessary for all living organisms because they maintain the reaction speeds of all metabolic reactions at a rate that can sustain life. Without enzymes, how long would it take to digest one meal?

• 2-3 days

• 1-2 days

• 2-3 weeks

• 4-6 hours

Enzymes are specific to one particular substrate because:

• They are carbohydrates

• They are made of lipids

• They are complementary in shape to the substrate

• They are nucleic acids

What is the lock and key model of enzyme activity?

• Enzymes and substrates collide randomly

• Enzymes and substrates randomly move about in solution

• Enzymes are specific to one particular substrate

• Enzymes change shape to fit the substrate

What is the optimum temperature for enzyme activity in the human body?

• 37°C

• 0°C

• 50°C

• 25°C

What happens when enzymes are denatured due to high temperatures?

• They become more efficient

• They lose their shape and activity stops

• They work slower

• They change their substrate specificity

What is the effect of increasing temperature on enzyme activity?

• Enzymes work faster

• Enzymes denature

• Enzymes change shape

• Enzymes work slower

What is the optimum pH for most enzymes?

• pH 2

• pH 10

• pH 5

• pH 7

What happens if the pH is too high or too low for enzymes?

• Enzymes become more efficient

• Enzymes denature

• Enzymes work slower

• Enzymes change shape

What is the lock and key hypothesis in enzyme activity?

• Enzymes are specific to one particular substrate

• Enzymes change shape to fit the substrate

• Enzymes and substrates collide randomly

• Enzymes and substrates randomly move about in solution