The energy required to start a reaction

• enzyme

• substrate

• activation energy

• product

A substance formed by a chemical reaction

• product

• enzyme

• substrate

• activation energy

A substance that binds to an enzyme

• activation energy

• substrate

• enzyme

• product

A protein that speeds up a reaction

• enzyme

• substrate

• activation energy

• product

Which of the following is a substance that lowers activation energy ?

• a substrate

• an ion

• a reactant

• a catalyst

In which of the following are bonds broken and new bonds form ?

• chemical reactions

• isotopes

• elements

• polar molecules

Which statement is true of chemical equations ?

• Reactions are on the right

• products are on the right

• products are fewer atoms than reactants

• reactants are fewer atoms than products

Which of the statements below is FALSE ?

• The enzyme works best in pH 2

• The enzyme is called chymotrypsin

• The enzyme stops working after pH 10

• The optimum pH for this enzyme is 7-9.

Which of the following influence enzyme activity ?

• pH and temperature

• pH and concentration

• pressure and pH

• temperature and pressure

The arrow is pointing to the ............on this enzyme

• enzyme

• enzyme-substrate complex

• active site

• substrate