Question

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:

To determine the true statements, we analyze each option:

1. “Maltose is made of galactose and fructose.”

Maltose is a disaccharide formed from two glucose molecules (not galactose + fructose). This statement is false.

1. “Maltose has the same number of carbon atoms as sucrose and lactose.”

Maltose, sucrose, and lactose are all disaccharides with the formula \( \ce{C_{12}H_{22}O_{11}} \), so they have the same number of carbon atoms (12). This statement is true.

1. “Maltose, lactose, and sucrose all contain glucose.”

• Maltose: 2 glucose molecules.
• Lactose: glucose + galactose.
• Sucrose: glucose + fructose.

All three contain glucose. This statement is true.

1. “Maltose is found in rye and barley.”

Maltose is commonly found in germinating grains like rye and barley (produced during starch breakdown). This statement 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.

(Note: The first statement is false and should not be selected.)