Why does the enzyme pepsin (present in the stomach) denature in the intestine?
the enzyme denatures due to change in temperature as it enters the intestine.
the enzyme denatures due to the alkaline environment of the intestine.
the enzyme denatures due to lack of substrate molecules in the intestine.

What mistake did john needham make that caused him to conclude that spontaneous generation for microorganisms occurred? a. he re-contaminated his boiled broth solutions. b. he destroyed the vital force in the solutions. c. he did not boil his broth solutions, only warmed them. d. he failed to seal his flasks of boiled broth. e. he allowed his assistant to conduct the experiment which he did not monitor closely.