How Enzymes Work

Part A

In general, enzymes are what kinds of molecules?

	nucleic acids
	lipids
	minerals
	carbohydrates
	proteins

Correct

Enzymes are proteins.

Part B

Enzymes work by _____.

	increasing the potential energy difference between reactant and product
	decreasing the potential energy difference between reactant and product
	reducing EA
	adding a phosphate group to a reactant
	adding energy to a reaction

Correct

Enzymes work by reducing the energy of activation.

Part C

An enzyme _____.

	increases the EA of a reaction
	is a source of energy for endergonic reactions
	can bind to nearly any molecule
	is an organic catalyst
	is a inorganic catalyst

Correct

Enzymes are proteins that behave as catalysts.

Part D

What name is given to the reactants in an enzymatically catalyzed reaction?

	EA
	active sites
	products
	substrate
	reactors

Correct

This is the name given to the reactants in an enzymatically catalyzed reaction.

Part E

As a result of its involvement in a reaction, an enzyme _____.

	is used up
	is unchanged
	loses a phosphate group
	loses energy
	permanently alters its shape.

Correct

Enzymes are not changed as a result of their participation in a reaction.

Part F

What is the correct label for "A"?

	ATP
	substrate energy
	enzyme energy
	energy of activation
	uphill

Correct

The energy of activation must be overcome in order for a reaction to proceed.