3. Which of the following statements explains why atoms are always neutral in charge
a. They have the same number of protons as the atoms of all other elements.
b.
They have protons that are identical to the protons of all other elements.
C. They have the same size as the atoms of all other elements.
d. They have the same number of protons as electrons.

1. an enzyme is considered a(n) because it speeds up a chemical reaction without being used up.2. in a catalyzed reaction, a reactant is often called a(n) . an enzyme is specific because the shape of its matches only particular reactants.4. an enzyme speeds up reactions by lowering the . the between an active site and its substrate often strains bonds and the reaction proceed.6. a( , which is often a vitamin, binds to an enzyme and plays a role in catalysis.7. high temperatures or changes in ph can an enzyme, causing it to lose its shape and biological activity.