Protein Digestion and Absorption

Which part of an amino acid determines its unique identity and properties?

• Amine group

• Carboxylic acid group

• Alpha carbon

• R-group

Where does the initial digestion of proteins primarily occur?

• Small intestine

• Stomach

• Liver

• Pancreas

What are the products of protein digestion by pepsin and pancreatic proteases?

• Only individual amino acids

• Only small peptides

• Individual amino acids and small peptides

• Large protein fragments

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What type of active transport mechanism is primarily responsible for the absorption of individual amino acids into enterocytes from the small intestine's lumen?

• Primary active transport

• Secondary active transport

• Tertiary active transport

• Simple diffusion

How are amino acids primarily transported from the intestinal lumen into the enterocyte?

• Through primary active transport, directly using ATP.

• Via facilitated diffusion, moving down their concentration gradient.

• Through secondary active transport, coupled with sodium movement.

• By simple diffusion across the cell membrane.