The breakdown of lactose in the small intestine is mediated by the enzyme lactase, and the products are galactose and glucose. Galactose and glucose are which of the following?

Rationale

Galactose and glucose are monosaccharides.

Both galactose and glucose are simple sugars, classified as monosaccharides, which are the most basic form of carbohydrates that cannot be hydrolyzed into simpler sugars. They serve as essential building blocks for more complex carbohydrate structures.

A (Disaccharides) YOUR ANSWER

Disaccharides consist of two monosaccharide units linked together by a glycosidic bond. Common examples include sucrose and lactose. Since galactose and glucose are individual sugar units and not combined, they do not fit into the disaccharide category.

B (Oligosaccharides) YOUR ANSWER

Oligosaccharides are short chains of monosaccharides, typically containing 2 to 10 sugar units. They are formed by the combination of several monosaccharides but are not individual sugars themselves. Galactose and glucose represent single units rather than a combination, thus they are not classified as oligosaccharides.

C (Polysaccharides) YOUR ANSWER

Polysaccharides are large carbohydrate molecules composed of long chains of monosaccharide units, often serving as energy storage or structural components (e.g., starch and cellulose). Since both galactose and glucose are single sugar molecules, they cannot be considered polysaccharides.

D (Monosaccharides) CORRECT

Galactose and glucose are both monosaccharides, meaning they are the simplest form of carbohydrates and cannot be broken down into smaller sugar molecules. They are crucial to various metabolic processes and are the primary products of lactose breakdown in the small intestine.

Conclusion

Galactose and glucose, resulting from lactose breakdown, are classified as monosaccharides due to their single-unit structure. This classification distinguishes them from disaccharides, oligosaccharides, and polysaccharides, which are composed of multiple sugar units. Understanding the classification of these sugars is fundamental in biochemistry and nutrition, particularly in relation to lactose digestion and metabolism.

The breakdown of lactose in the small intestine is mediated by the enzyme lactase, and the products are galactose and glucose. Galactose and glucose are which of the following?

Galactose and glucose are monosaccharides.

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