Which statement about intermolecular forces is true?

group of answer choices
a. only occur in ionic bonds.
b. they have to be overcome to decompose a substance.
c. these forces hold atoms together in a molecule.
d. they are responsible for the physical properties of matter.

Which of the following characteristics are true of enzymes? check all that apply. a.)the structure of an enzyme can change if conditions change. b.)a single enzyme can normally catalyze a wide variety of reactions under many conditions. c.)enzymes are found only in nonliving systems. d.)enzymes allow living things to regulate body conditions through feedback mechanisms. e.)enzymes bind to specific substrates in specific ways. f.)enzymes increase the rate of reaction. g.)when shown in energy-reaction diagrams, enzymes represent the higher activation energy.