a tomato plant in a greenhouse was found to be infected with tobacco mosaic virus. a few weeks later, nearby plants were also found to be infected with the virus. which of the following best describes how the virus reproduced? a) the virus made its own spores b) the virus produced seeds in the tomato c) the virus used the host plant's resources and machinery to reproduce d) the virus immediately killed the host plant and was free to reproduce

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

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

What kinds of foods are high in lipids?