Which of the following statements about maltose are correct?
1. it is formed from two monosaccharide molecules of the same type
2. it is soluble in water
3. it is a reducing sugar

All the three statements about maltose are correct.

Explanation:

1) Maltose is formed from the combination of two same type of monosaccharide i. e. two glucose molecules.

2) Maltose is soluble in water. Its solubility value is 1.080 g/mL.

3) Maltose is a reducing sugar because it act as a reducing agent due to the presence of aldehyde group with glucose molecules.

The three statements are correct.

Explanation: Maltose is a disaccharide consisting of two D-glucose (monosaccharide) units joined covalently by an O-glycosidic bond between carbon 1 (C-1) of one glucose unit and carbon 4 (C-4) of another glucose unit. O-glycosidic bond is formed when a hydroxyl group of one sugar reacts with the anorexic carbon of another sugar molecule.

Maltose dissolves in water, therefore it is soluble in water.

Maltose is a reducing disaccharide because the anomeric carbon atom (C-1) of the second glucose residue can be oxidized to a carboxyl group. Thus maltose is reducing sugar because it is capable of reducing ferric or cupric ion. Reducing sugars reduce cupric Cu2+ or ferric ions Fe3+ and have their carbonyl carbon oxidized to a carboxyl group.

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a- all cells come from pre-existing cells