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Process of breaking down food molecules into smaller molecules with the aid of enzymes in the digestive tract
Two factors that play key roles in the efficacy of digestive enzymes
Temperature - hot and cold, enzyme denature when heated, enzyme slow down in cold temp. pH - change in pH can lead to deactivation
Major functions of the digestive system
1. Ingestion 2. Digestion (mechanical and chemical) 3. Absorption 4. Propulsion 5. Defecation 6. Secretion
What does it mean for an enzyme to be substrate specific?
1 enzyme for 1 substrate. Based on the lock-and-key theory
Why do lipids pose special problems for digestion?
Water and oil do not mix. Lipid are fat soluble, are water insoluble, hydrophobic, lipophilic
Optimal pH for salivary amylase? Where is salivary amylase found?
pH of 6 is optimal. Found in oral cavity
Boiling and freezing on enzyme activity
Boiling - denature, destroy, deactivate. Freezing - slows down, inactivate.
Was salivary amylase able to digest cellulose? Why or why not?
No because we do not have the enzyme cellulase
Optimal pH for lipase
pH of 2 for the stomach. pH of 8 for the pancreas (duodenum has basic environment)
What was the effect of bile salts on lipid digestion?
Emulsification - mechanical digestion because don't change lipid globules
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