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Ch.25 Protein and Amino Acid Metabolism
Chapter 25, Problem 22.34

What are the products of digestion of proteins, triacylglycerols, maltose, sucrose, lactose, and starch?

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1
Identify the type of biomolecule for each substance: proteins, triacylglycerols, and carbohydrates (maltose, sucrose, lactose, starch).
For proteins, understand that they are broken down by enzymes into amino acids.
For triacylglycerols, recognize that they are digested into glycerol and fatty acids.
For carbohydrates like maltose, sucrose, and lactose, note that they are disaccharides and are broken down into their respective monosaccharides: maltose into glucose, sucrose into glucose and fructose, lactose into glucose and galactose.
For starch, which is a polysaccharide, understand that it is broken down into glucose units.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Protein Digestion

Protein digestion involves breaking down proteins into smaller peptides and amino acids through the action of enzymes like pepsin in the stomach and trypsin in the small intestine. This process is essential for the body to utilize amino acids for various functions, including tissue repair and enzyme production.
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Lipid Digestion

Triacylglycerols, or triglycerides, are digested primarily in the small intestine by enzymes called lipases, which break them down into glycerol and free fatty acids. This process is crucial for energy production and the absorption of fat-soluble vitamins.
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Carbohydrate Digestion

Carbohydrates like maltose, sucrose, lactose, and starch are digested into simple sugars (monosaccharides) through enzymatic action. Enzymes such as amylase and maltase play key roles in this process, allowing the body to convert carbohydrates into glucose for energy.
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