All of the following are evidence that a chemical reaction has occurred except

a. color change

b. formation of a precipitate

c. bubbles of gas

d. all of the above are evidence of a chemical reaction

Which of the following conclusions can be drawn

Which muscle is responsible for inhalation ?

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.