What is a scientific theory?
A.
A statement that cannot be tested scientifically
B.
A statement of fact that describes an action or set of events
C.
A guess or prediction based on previous experience or observation
D.
A unifying model or explanation based on a large body of experimental data

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

This group of organisms perform the process of ammonifcation. a. herbivores b. decomposers c. carnivores c. plants

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has