John wants to look at cells from the root of a young plant under the microscope. john cuts the tip off a root and puts it on a microscope slide. he adds two drops of iodine solution to stain the cells. he crushes the root by placing a plastic coverslip on top of it and pushing down on the coverslip gently with the eraser on his pencil.

a) suggest one reason why john uses a plastic coverslip instead of a glass one.

b) why does john need to stain the cells?

1. an enzyme is considered a(n) because it speeds up a chemical reaction without being used up.2. in a catalyzed reaction, a reactant is often called a(n) . an enzyme is specific because the shape of its matches only particular reactants.4. an enzyme speeds up reactions by lowering the . the between an active site and its substrate often strains bonds and the reaction proceed.6. a( , which is often a vitamin, binds to an enzyme and plays a role in catalysis.7. high temperatures or changes in ph can an enzyme, causing it to lose its shape and biological activity.