Which of the following is the best definition for homeostasis 1- The movement of particles from one side of a cellular membrane to another.

2- The tendency of particles to distribute themselves evenly across a membrane.

3- The ability to maintain and regulate stable internal conditions of the cell.

4- The transfer of molecules in response to excess solute relative to a solution.

1. environmental factors, such as ph and temperature, can affect the function of an enzyme. a. true b. false 2. which of the following is an organic molecules (ex. vitamins) that an enzyme? a. coenzyme b. product c. active site d. substrate 3. how do enzymes effect the speed of a chemical reaction? a. they speed it up b. they slow it down c. they have no effect on the speed of a reaction 4. during a chemical reaction, an enzyme is used up so that it can only be used one time. a. true b. false 5. which of the following results from a chemical reaction that is catalyzed by an enzymes? a. active site b. product c. substrate d. coenzyme

Which describes a grizzly bear’s habitat?

The big bang theory suggest that the universe is about - 300 million years old - 4.6 billion years old - 30 billion years old - 13 billion years old