Protein Digestion and Enzyme Function

The video explains protein denaturation and its role in digestion. It covers how proteins are broken down in the stomach and small intestine, emphasizing the importance of denaturation for enzyme access. Cooking is shown to aid protein digestion by denaturing proteins. The video also discusses enzyme stability in acidic environments, highlighting lactase as an example of an enzyme that can function in the stomach.

What is the primary role of hydrochloric acid in the stomach regarding proteins?

• To provide energy for digestion

• To denature proteins and aid enzyme access

• To absorb nutrients

• To neutralize stomach pH

Which enzyme is responsible for beginning the breakdown of protein bonds in the stomach?

• Amylase

• Lipase

• Pepsin

• Trypsin

Where does the majority of protein digestion occur after the stomach?

• Esophagus

• Small intestine

• Large intestine

• Mouth

How are amino acids primarily absorbed in the small intestine?

• By simple diffusion

• By facilitated diffusion or active transport

• By endocytosis

• By osmosis

What happens to proteins that are not digested in the small intestine?

• They are stored in the liver

• They are absorbed whole

• They are converted to glucose

• They are excreted in the large intestine

Why is cooking beneficial for protein digestion?

• It reduces the calorie content

• It increases the protein content

• It denatures proteins, making them more digestible

• It adds flavor to the food

What analogy is used to explain protein denaturation in the video?

• Rubber bands

• Chains

• Paper clips

• Strings

Which organism produces a lactase enzyme that is stable in acidic environments?

• E. coli

• Aspergillus niger

• Lactobacillus

• Saccharomyces cerevisiae

What is the purpose of an enteric coating on enzyme supplements?

• To enhance flavor

• To protect enzymes from stomach acid

• To increase shelf life

• To improve absorption in the mouth

What is the pH range in which most enzymes from other organisms are active?

• 1 to 3

• 7 to 9

• 5 to 7

• 3 to 5