Sodium bicarbonate ( NaHCO 3 ) in pancreatie juice cmulsifies fats. activates pepsin. neutralizes acid chyme. stimulates the release of insulin. Question 8 (1 point) E. coli are beneficial to humans because they: convert pepsinogen to pepsin. produce vitamins and amino acids. absotb water from the large intestine. synthesize urea from the breakdown of amino acids..