The Recommended Dietary Allowance (RDA) for iron is higher for girls than for boys during later adolescence (15 and 11 mg/day, respectively) because of

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