p. 53 A.Q. 1ab, 3abc
p. 53 A.Q. 1ab, 3abc
1a. What happens to chemical bonds during chemical reactions?
1a. During chemical reactions, the bonds change—they are formed or
broken.
1b. Why is the melting of ice not a chemical reaction?
1b. The melting of ice is not a chemical reaction because new chemicals are
not formed.
3a. What are enzymes?
3a. Enzymes are proteins that act as biological catalysts.
p. 53 A.Q. 1ab, 3abc
3b. Explain how enzymes work, including the role of the enzyme-substrate
complex.
3b. Enzymes provide a site where reactants, called substrates, can be brought
together to react. The substrates bind to a site on the enzyme called the
active site, forming an enzyme-substrate complex. This reduces the
activation energy needed for the reaction.
3c. A change in pH can change the shape of a protein. How might a change
in pH affect the function of an enzyme such as carbonic anhydrase?
3c. A change in pH might affect the function of an enzyme such as carbonic
anhydrase because the change in pH could change the shape of the enzyme.
If the enzyme and substrates no longer fit properly, the enzyme would no
longer be able to speed up the chemical reaction.