A scientist looks at a cell under a microscope. What key factor should the scientist use to determine whether a cell is prokaryotic or eukaryotic?

Which of the following statements is accurate in describing the activity of the lactase enzyme? a. lactase can function equally effectively at many different ph levels b. the shape of lactase does not change during the reaction c. lactase is converted to glucose and galactose by the reaction d. one lactase enzyme can catalyze many reactions