3.1 Chemical Reactions and Enzymes

Everything that happens in an organism—its growth, its interaction with the environment, its reproduction, and even its movement--is based on___________.

The elements or compounds that engage in a chemical reaction are known as ____________.

The elements or compounds produced by a chemical reaction are known as _____________.

Chemical reactions involve changes in the ________ that join atoms in compounds.

Chemical reactions that ________ energy require a source of energy.

In one direction the reaction releases energy, and in the other direction the reaction__________ energy.

Plants get that energy by trapping and storing the energy from ________ in energy-rich compounds. A

Animals consume plants or other animals for food. Then ___________ break apart the food and capture its energy

The energy that is needed to get a reaction started is called its ______________.

A catalyst is a substance that ____________ the rate of a chemical reaction without being consumed by the reaction.

Catalysts work by____________ a reaction's activation energy.

Enzymes are biological catalysts, and most enzymes are __________.

The role of enzymes is to speed up _________ that take place in cells.

Enzymes are very _______, generally catalyzing only one chemical reaction.

For a chemical reaction to occur, the reactants must collide with each other with sufficient energy that existing bonds will be broken and new bonds will be formed.If the reactants do not have enough energy, they will be _______ after the collision.