Question

animal milk is a natural source of the disaccharide lactose. the monosaccharides galactose and glucose combine to form lactose, which gives animal milk its sweet flavor. the model shows the chemical structures of lactose and sucrose. select the true statements. the monosaccharides in lactose are galactose and glucose. sucrose and lactose have the same chemical formula. sucrose and lactose have different chemical structures. the monosaccharides in sucrose are fructose and glucose.

Explanation:

1. For the first statement: The problem states "the monosaccharides galactose and glucose combine to form lactose", so this is true.
2. For the second statement: The formula for lactose is \( C_{12}H_{22}O_{11} \) and for sucrose is also \( C_{12}H_{22}O_{11} \), so they have the same formula, this is true.
3. For the third statement: The models show different chemical structures (lactose is from galactose and glucose, sucrose from glucose and fructose with different linkages), so this is true.
4. For the fourth statement: Sucrose is formed from glucose and fructose (as seen in the model where one is glucose and the other is fructose), so this is true.

Answer:

A. The monosaccharides in lactose are galactose and glucose.
B. Sucrose and lactose have the same chemical formula.
C. Sucrose and lactose have different chemical structures.
D. The monosaccharides in sucrose are fructose and glucose.