Dna strands are held together by hydrogen bonds. what characteristic of hydrogen bonds make them work well during dna replication? a. they are stronger than ionic bonds. b. they can be easily broken. c. they are equally as strong as covalent bonds. d. they cannot be easily broken.

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 is one form of rna that transports a specific amino acid to a ribosome during protein synthesis.

About __ of the mass of the cell is water