Which of the following statements are true of the digestive processes? (Read carefully and select all of the correct statements.)
A)Chewing and the churning of the stomach are the only forms of mechanical digestion.
B)Chemical digestion requires enzymes,each of which is specific for one type of food.
C)An enzyme that requires a pH of 2 usually will not work at a pH of 8.
D)Mechanical digestion is helpful because it increases the surface area of food for enzymes to function efficiently.

Question

Quizplus · Accepted Answer

A) is false because there are other forms of mechanical digestion, such as the muscular contractions of the small intestine. 
B) is true because enzymes are specific for a certain type of substrate (food molecule). 
C) is true because enzymes have an optimal pH range in which they are most effective. 
D) is true because mechanical digestion breaks down food into smaller pieces and increases the surface area for enzymes to break down.

Which of the Following Statements Are True of the Digestive