HViruses are simple particles that contain either DNA or RNA protected by a protein coat which statement best seests why viruses must have host cells to replicate the genetic materials and build new particles
They back the ability to enter host cells
They lack eurymes necessary to carry out metabolic reactions.
They lack protection around their genetic materials
They lack nucleic acids necessary to pass on traits

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

Identify characteristics of energy from the sun. check all that apply. almost all of the energy on earth comes from the sun. energy from the sun is known as mechanical energy. the energy in fossil fuels originally came from the sun. plants convert the energy of sunlight into chemical energy.

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?