Target Exam

CUET

Subject

Chemistry

Chapter

Organic: Biomolecules

Question:

Read the passage carefully and answer.

Carbohydrates are essential for both plants and animals. Some common examples of carbohydrates are glucose, fructose, sucrose, glycogen, cellulose and starch. They form a major portion of our food. Honey has been used for a long time as an instant source of energy in Ayurvedic medicine. Carbohydrates are used as storage molecules in both plants and animals. The cell wall of bacteria and plants is made of cellulose. We use cellulose in the form of wood for making furniture and as cotton fiber for clothing. They also provide raw material for textiles, paper, lacquers, and breweries. Carbohydrates are classified as Monosaccharides, Oligosaccharides and Polysaccharides on the basis of their behavior towards hydrolysis. Monosaccharides cannot be hydrolyzed further to simpler units whereas oligosaccharides can yield 2-10 units of monosaccharides on hydrolysis. Polysaccharides, which are non-sugars yield a large number of monosaccharide units on hydrolysis.

Answer the following questions about carbohydrates:

Hydrolytic products of maltose are?

Options:

Glucose and glucose

Glucose and fructose

Glucose and galactose

Galactose and fructose

Correct Answer:

Glucose and glucose

Explanation:

The correct answer is Option (1) → Glucose and glucose

Maltose, also known as malt sugar, is a disaccharide. A disaccharide is a carbohydrate formed when two monosaccharides are joined by a glycosidic linkage.

  • Composition: Maltose is specifically composed of two units of $\alpha$-D-glucose.
  • The Linkage: These two glucose units are linked together by an $\alpha(1\rightarrow4)$ glycosidic bond. This means the first carbon (anomeric carbon) of one glucose molecule is connected to the fourth carbon of the second glucose molecule.
  • The Reaction: When maltose undergoes hydrolysis (reacts with water), this glycosidic bond is broken. This process is typically catalyzed by the enzyme maltase or by dilute acids.