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. sucrose and lactose have the same chemical formula. the monosaccharides in lactose are galactose and glucose. sucrose and lactose have different chemical structures. the monosaccharides in sucrose are fructose and glucose.

Explanation:

1. For "Sucrose and lactose have the same chemical formula": From the model, lactose has formula $\ce{C_{12}H_{22}O_{11}}$ and sucrose also has $\ce{C_{12}H_{22}O_{11}}$, so this is true.
2. For "The monosaccharides in lactose are galactose and glucose": The text states "The monosaccharides galactose and glucose combine to form lactose", so this is true.
3. For "Sucrose and lactose have different chemical structures": The model shows different arrangements of atoms (lactose from galactose + glucose, sucrose from glucose + fructose), so structures differ, true.
4. For "The monosaccharides in sucrose are fructose and glucose": The sucrose structure shows glucose and fructose, so this is true.

Answer:

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