38. A student wants to test the hypothesis that catalysts speed up chemical reactions. She decides to use beef liver since she knows that the liver contains catalysts that speed up chemical reactions in mammals. She sets up her reaction tubes as follows: test tube 1 has the
reaction chemicals and no liver. Test tube 2 has liver but no reaction chemicals. Test tube 3 has the reaction chemicals and a small piece
of liver. She observes the following: (1 point)
Test Tube 1 Small gas bubbles form
Test Tube 2
No reaction
Test Tube 3 Vigorous bubbling, test tube hot