Question

maltose is a disaccharide found mostly in the seeds of wheat, oats, rice, barley, rye, and millet. the model shows the chemical structure of maltose. chemical structure of maltose (two glucose units, formula c₁₂h₂₂o₁₁) compare the chemical structure of maltose to lactose and sucrose. chemical structures: lactose (galactose + glucose, formula c₁₂h₂₂o₁₁), sucrose (glucose + fructose, formula c₁₂h₂₂o₁₁) select the true statements. maltose is made of galactose and fructose. maltose has the same number of carbon atoms as sucrose and lactose. maltose, lactose, and sucrose all contain glucose. maltose is found in rye and barley.

Explanation:

1. Analyze "Maltose is made of galactose and fructose": Maltose's structure shows it's two glucose units, so this is false.
2. Analyze "Maltose has the same number of carbon atoms as sucrose and lactose": Maltose ($\ce{C_{12}H_{22}O_{11}}$), lactose ($\ce{C_{12}H_{22}O_{11}}$), sucrose ($\ce{C_{12}H_{22}O_{11}}$) all have 12 C atoms, so this is true.
3. Analyze "Maltose, lactose, and sucrose all contain glucose": Maltose has two glucose; lactose has glucose and galactose; sucrose has glucose and fructose. So all contain glucose, true.
4. Analyze "Maltose is found in rye and barley": The text says maltose is in seeds of wheat, oats, rice, barley, rye, millet, so this is true.

Answer:

• Maltose has the same number of carbon atoms as sucrose and lactose.
• Maltose, lactose, and sucrose all contain glucose.
• Maltose is found in rye and barley.