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Medical College Admission Test
Biological and Biochemical Foundations of Living Systems

Understanding Lactase and Enzyme Functionality

Medium Biochemistry Enzymes

Enzymes are biological catalysts that speed up chemical reactions in the body. A certain enzyme, known as lactase, catalyzes the hydrolysis of lactose into glucose and galactose. In individuals with lactose intolerance, the activity of lactase is significantly reduced, leading to the accumulation of lactose in the gut, which can cause gastrointestinal discomfort.

Consider the following statements regarding enzyme kinetics and lactase:

  • A) Increasing the temperature beyond the optimal range will always increase the activity of lactase.
  • B) Lactase activity can be influenced by the pH of its environment.
  • C) Lactase is an example of a coenzyme that requires vitamin D for its activity.
  • D) Lactase can catalyze reactions of other similar disaccharides with equal efficiency to lactose.

Which statement is true regarding lactase?

Hint

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