Home » Which of the following is an anticoagulant that prevents blood clotting? Carbohydrates MCQs Which of the following is an anticoagulant that prevents blood clotting? January 18, 2022 20 Views Q. Which of the following is an anticoagulant that prevents blood clotting? A. Leucine B. Alaninne C. Mucopolysaccharide heparin D. Valine Answer: Leucine