Question

select the true statements.
maltose, lactose, and sucrose all contain glucose.
maltose is found in rye and barley.
maltose is made of galactose and fructose.
maltose has the same number of carbon atoms as sucrose and lactose.

Explanation:

1. Statement 1: Maltose is glucose + glucose, lactose is glucose + galactose, sucrose is glucose + fructose. So all three disaccharides contain glucose. This statement is true.
2. Statement 2: Maltose is commonly found in germinating grains like rye and barley (from the breakdown of starch). This statement is true.
3. Statement 3: Maltose is formed from two glucose molecules, not galactose and fructose. This statement is false.
4. Statement 4: Maltose, sucrose, and lactose all have the formula \( C_{12}H_{22}O_{11} \), so they have the same number of carbon atoms (12). This statement is true.

Answer:

• True: Maltose, lactose, and sucrose all contain glucose.
• True: Maltose is found in rye and barley.
• False: Maltose is made of galactose and fructose.
• True: Maltose has the same number of carbon atoms as sucrose and lactose.