Biology · Chemistry

Carbohydrates and Biomolecules

1,073 Questions

Carbohydrates and biomolecules questions test your understanding of sugars, monosaccharides, and metabolic substrates. The topic covers food transportation in plants and the biochemical properties of sweeteners. Practicing these questions builds a strong foundation for exam preparation.

Disaccharides and monosaccharidesArtificial sweetenersGlycogen storagePlant food transportGlycoprotein hormones

Carbohydrates and Biomolecules Questions

Multiple choice

British gum is related to

  1. starch

  2. cellulose

  3. glycogen

  4. insulin

  5. Both (2) and (3)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Starch solution heated at about 200oC produces a lower polysaccharide (dextrin) which is used as an adhesive under the name British gum.

Multiple choice

Which of the following are examples of structural polysaccharides?

  1. Starch
  2. Cellulose
  3. Chitin
  4. Glycogen
  5. Pectin

    Note: Structural polysaccharides are the polysaccharides that are found to form the structure of an organism.
    Storage polysaccharides are store in the organ of plants and animals.

  1. Only 1 and 2

  2. Only 1, 2 and 3

  3. 2, 3 and 5

  4. 2, 3 and 4

  5. 1, 2, 3, 4 and 5
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, this is correct. Structural polysaccharides are the polysaccharides that are found to form the structure of an organism. Cellulose is found plants, chitin is  found in outer skeleton of insects and crabs, and pectin is a structural heteropolysaccharide contained in the primary cell walls of terrestrial plants.

Multiple choice

Which of the following is a pair of ketohexoses?

  1. Mannose and talose

  2. Sorbose and psicose

  3. Arabinose and xylose

  4. Ribulose and xylulose

  5. Erythrose and erythrulose
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Correct answer. Sorbose and psicose are examples of ketohexoses.

Multiple choice

Which one of the following sets has aldohexoses?

  1. Galactose, mannose, glucose

  2. Galactose, fructose, glucose

  3. Fructose, mannose, glucose

  4. Mannose, ribulose, galactose

  5. Mannose, ribulose, fructose
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glucose, galactose, mannose: All the three are aldohexoses.

Multiple choice

Which of the following are examples of heteroglycans?

  1. Dextran
  2. Heparin
  3. Amylopectin
  4. Hyaluronic acid
  5. Chondroitin-4-sulphate

  1. Only 3, 4 and 5

  2. Only 1, 2 and 3

  3. Only 1, 3 and 5

  4. Only 2, 3 and 4

  5. Only 2, 4 and 5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dextran is a complex, branched (heteroglycans) homopolysaccharide made of many glucose molecules. Amylopectin is homopolysaccharide of glucose. Chondroitin-4-sulphate heteropolysaccharide is composed of D-glucuronic acid and N-acetyl-D-galactosamine-4-O-sulphate. Heparin is heteropolysaccharides composed of D-glucuronic acid, L-iduronic acid and N-sulpho-D-glucosamine. Hyaluronic acid is heteropolysaccharide composed of D-glucuronic acid and N-acetyl-D-glucosamine. Chondroitin-4-sulphate heteropolysaccharide is  composed of D-glucuronic acid and N-acetyl-D-galactosamine-4-O-sulphate.

Multiple choice

Fructose is the sweetest ………….. sugar.

  1. natural

  2. artificial

  3. both (a) and (b)

  4. neither (a) nor (b)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fructose is a simple monosaccharide found in many plants and is the sweetest naturally occurring carbohydrate. It is much sweeter than glucose or sucrose.

Multiple choice

The main constituents of carbohydrate are

  1. carbon, hydrogen and nitrogen

  2. hydrogen and oxygen

  3. chlorine, hydrogen and oxygen

  4. carbon, hydrogen and oxygen

  5. carbon, hydrogen and sulphur
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The main constituents of carbohydrate are carbon, hydrogen and oxygen.

Multiple choice

The primary cell wall in plants is made of

  1. cellulose and pectin

  2. cellulose and glycan

  3. cellulose microfibrils and lignin

  4. cellulose, pectin and glycan
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Primary cell wall in plants is composed of polysaccharides namely cellulose, pectin and cross-linking glycans.