Enzyme Function and Activity

The video tutorial explains enzymes as a special class of proteins that act as catalysts in biological reactions. It covers the role of enzymes in speeding up reactions without being consumed, using hemoglobin as an example. The tutorial also discusses chemical reactions, activation energy, and how enzymes lower this energy to facilitate reactions. Factors affecting enzyme activity, such as temperature, concentration, and pH, are also explored.

What is the primary function of enzymes in biological systems?

• To provide energy for reactions

• To act as a structural component

• To speed up chemical reactions

• To store genetic information

Which of the following is an example of an enzyme in the human body?

• Water

• Oxygen

• Hemoglobin

• Glucose

What are the initial substances called that participate in a chemical reaction?

• Catalysts

• Enzymes

• Reactants

• Products

What is the term for the energy required to start a chemical reaction?

• Activation energy

• Thermal energy

• Kinetic energy

• Potential energy

How do enzymes affect the activation energy of a reaction?

• They eliminate it

• They decrease it

• They increase it

• They have no effect

What happens to an enzyme after it catalyzes a reaction?

• It is consumed

• It becomes inactive

• It changes shape

• It remains unchanged

Which factor does NOT affect enzyme activity?

• Temperature

• Color of the enzyme

• pH levels

• Concentration of reactants

At what temperature do human enzymes typically function best?

• 37 degrees Celsius

• 25 degrees Celsius

• 0 degrees Celsius

• 100 degrees Celsius

Why might an enzyme not function properly in the stomach if it is designed for the small intestine?

• The temperature is too high

• There is too much light

• The enzyme is too large

• The pH is too low

What happens when all enzymes are saturated with substrate?

• The reaction rate increases

• The enzymes are destroyed

• The reaction stops

• The reaction rate levels off