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Difficulty: MediumAnimal Nutrition and Digestive System

Pancreatic juice contains key digestive enzymes, including trypsin and pancreatic lipase, which act in the duodenum. Which of the following environmental conditions is required for these enzymes to function at their optimal rate?

  1. An alkaline medium (pH 7.5−8.5\text{pH } 7.5 - 8.5) at a body temperature of 37∘C37^\circ\text{C}Answer
  2. B
    A highly acidic medium (pH 1.5−2.0\text{pH } 1.5 - 2.0) at a body temperature of 37∘C37^\circ\text{C}
  3. C
    An alkaline medium at 0∘C0^\circ\text{C}, because freezing temperatures permanently denature enzymes
  4. D
    An acidic medium at 100∘C100^\circ\text{C}, because boiling increases enzyme kinetic energy to maximum catalytic rates

Answer

An alkaline medium (pH 7.5−8.5\text{pH } 7.5 - 8.5) at a body temperature of 37∘C37^\circ\text{C}
Pancreatic enzymes such as trypsin and lipase require an alkaline environment (pH 7.5−8.5\text{pH } 7.5 - 8.5) created by alkaline secretions in the duodenum, functioning at their maximum catalytic rate at mammalian body temperature (37∘C37^\circ\text{C}).

Step-by-Step Solution

1
Identify the site of action and origin of pancreatic enzymes
Trypsin and pancreatic lipase are secreted by the pancreas into the duodenum.
Understanding the physiological environment of the duodenum determines the required pH.
2
Determine the optimal pH for pancreatic enzyme function
The neutralization of acidic chyme by bile and sodium hydrogen carbonate creates an alkaline environment (pH 7.5−8.5\text{pH } 7.5 - 8.5).
Pancreatic enzymes require an alkaline pH to achieve their maximum catalytic rate.
3
Determine the optimal temperature condition for mammalian biological catalysis
Optimal enzyme action occurs at mammalian body temperature (37∘C37^\circ\text{C}).
Lower temperatures cause temporary inactivation due to low kinetic energy, while extreme high temperatures causes permanent denaturation.

Key Concept

Pancreatic enzyme activity dependence on alkaline pH and optimal body temperature
Estimated Time:1m 0s
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Topics

Animal Nutrition and Digestive System

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