biochem - banerjee - 2

What was the first enzyme to be discovered?

• Diastase

• Pepsin

• Invertase

• Trypsin

What is an apoenzyme?

• An enzyme without its cofactor

• A complete enzyme with its cofactor

• A type of coenzyme

• A metal ion

Which of the following is a coenzyme?

• NAD+

• Iron

• Copper

• Zinc

How do enzymes affect activation energy?

• They increase activation energy.

• They have no effect on activation energy.

• They lower activation energy.

• They eliminate activation energy.

What can affect the activity of an enzyme?

• Changes in color and shape

• Changes in pH and temperature

• Changes in size and weight

• Changes in speed and direction

What happens to enzymes after a reaction?

• They are consumed.

• They change the product.

• They remain unchanged.

• They change the reactants.

What do enzymes not change in a reaction?

• Activation energy

• Overall free energy

• Reaction rate

• Substrate concentration

What is the transition state in a chemical reaction?

• The final stable form of the product

• The initial state of the reactants

• A contorted form of the reactants where bonds are ready to break

• The state where the reaction has the lowest energy

What is the Fischer model of enzyme-substrate interaction?

• Enzymes are flexible and change shape with substrates

• Enzymes are rigid and act as an exact complement to the substrate

• Enzymes dissolve in the substrate

• Enzymes are identical to the substrate

What is measured in products made per time in enzyme kinetics?

• Reaction rate

• Enzyme concentration

• Enzyme velocity

• Substrate concentration