Question

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

Answer 1

True: 1, 3, 4.
False: 2.

Brief reasons:
- Maltose, sucrose, and lactose are disaccharides (two hexoses) and each has formula C12H22O11 (12 carbons).
- Maltose is two glucose units (not galactose + fructose).
- Lactose (glucose+galactose) and sucrose (glucose+fructose) both contain glucose, and maltose is glucose+glucose.
- Maltose is produced when starch in grains (e.g., rye, barley) is broken down during germination/malting, so it is found in those grains.