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

Arabinoxylans are ________.

  1. homopolymers of one type of pentose sugars

  2. homopolymers of one type of hexose sugars

  3. copolymers of two type of pentose sugars

  4. copolymers of two type of hexose sugars

  5. copolymers of pentose and hexose sugars
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Arabinoxylans are found in both the primary and secondary cell walls of plants and are the copolymers of two pentose sugars: arabinose and xylose.

Multiple choice

Which of the following are examples of heteropolysaccharides?

  1. Dextran
  2. Heparin
  3. Amylopectin
  4. Hyaluronic acid
  5. Chondroitin-4-sulfate Select the correct answer using codes given below:

  1. 1, 2 and 3 only

  2. 1, 3 and 5 only

  3. 2, 3 and 4 only

  4. 2, 4 and 5 only

  5. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Heparin is heteropolysaccharide composed of D-glucuronic acid, L-iduronic acid and N-sulfo-D-glucosamine. Hyaluronic acid is heteropolysaccharide composed of D-glucuronic acid and N-acetyl-D-glucosamine. Chondroitin-4-sulfate heteropolysaccharide composed of D-glucuronic acid and N-acetyl-D-galactosamine-4-O-sulfate.

Multiple choice

Which of the following carbohydrates is/are classified as disaccharides?

A. Nigerose B. Lyxose C. Laminaribiose D. Sophorose

  1. Only A

  2. Only B

  3. Only D

  4. Only A, B and C

  5. Only A, C and D
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

A. Nigerose is a disaccharide and consists of two glucose monomer units. B. Lyxose is a monosacharide. C. Laminaribiose two glucose monomer units. D. Sophorose is a disaccharide and consists of two glucose monomer units.

Hence, A, C and D are classified as disaccharides.

Multiple choice

Which of the following statements is/are not false?

  1. Rings with five and six atoms monosaccharides are called pyranose and furanose forms, respectively.
  2. In polysaccharides, monosaccharide units are joined by peptide bond.
  3. Trehalose consists of two glucose units.

  1. Only 1

  2. Only 2

  3. Only 3

  4. Only 1 and 2

  5. Only 2 and 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This option is correct because trehalose is a disaccharide and consists of two glucose monomeric units. Hence, only statement 3 is true.

Multiple choice

Consider the following sugars:

  1. Cellulose 2. Deoxyribose
  2. Fructose 4. Galactose Which of these are monosacchaides?

  1. 1 only

  2. 2 and 3

  3. 2, 3 and 4

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

Monosaccharides are simple sugars that cannot be hydrolyzed into simpler sugars. Deoxyribose (2), Fructose (3), and Galactose (4) are all monosaccharides. Cellulose (1) is a polysaccharide made of glucose units. Option C correctly identifies 2, 3, and 4 as monosaccharides.

Multiple choice

Which of the following is a triose?

  1. Ribulose

  2. Ribose

  3. Glyceraldehyde

  4. Fructose

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Glyceraldehyde consists of four 3-carbons, which is an intermediate component of the glycolysis.

Multiple choice

Glycogen is a branched polymer of glucose. It has

  1. no reducing ends

  2. no non-reducing ends

  3. one reducing end and several non-reducing ends

  4. one non-reducing end and several reducing ends
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Glycogen is a branched molecule of glucose subunit of glucose molecules, which are linked by á1-4 linkage and á1-6 linkage at the branching point. So, it has only one reducing end and several non-reducing ends.

Multiple choice

Match the following:

 
A B
1. Alpha 1, 6 glucosidase a. Branching enzyme during glycogenesis
2. Alpha 1, 6, 1, 4 trans glucosidase b. Rate limiting enzyme of glycolysis
3. Alkaptonuria c. Debranching enzyme in glycolysis
4. Phospho fructo kinase1 d. Homogentisate 1, 2 dioxygenase

  1. 1 - c, 2 - a, 3 - d, 4 - b

  2. 1 - a, 2 - c, 3 - d, 4 - b

  3. 1 - d, 2 - a, 3 - c, 4 - b

  4. 1 - c, 2 - b, 3 - d, 4 - a
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In an enzyme mix, both substrates and inhibitors have been added. Both of them interact with the same binding site of the enzyme.