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

Which of the following are polysaccharide compounds?

A. Glycogen B. Cellulose C. Starch D. Sucrose

  1. A, B and C

  2. A, C and D

  3. Only A and B

  4. A, B and D

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glycogen is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi. Cellulose is an organic compound with the formula (C6H10O5)n, a polysaccharide consisting of a linear chain of several hundred to many thousands of β(1→4) linked D-glucose units. Starch or amylum is a carbohydrate consisting of a large number of glucose units joined by glycosidic bonds. This polysaccharide is produced by most green plants.

Multiple choice

Which one of the following pairs represents water soluble dietary fiber?

  1. Fructans, inulin

  2. Mucilage, chitin

  3. Pectin, lignin

  4. Cellulose, hemicellulose

  5. Lignin, chitin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct answer. Water soluble dietary fiber includes pectins, gums and mucilage, fructans, inulin, etc., which are found mainly in plant cells. Water insoluble dietary fibre includes- cellulose, hemicellulose and lignin, chitin, xanthan, etc., which make up the structural parts of plant cell walls.

Multiple choice

Which of the following statements is/are correct?

P. Mucilage is an example of soluble dietary fibers that may help in controlling blood cholesterol. Q. Nigerose is composed of two glucose monomer units. R. Melibiose consists of a glucose monomer and a fructose monomer units. S. Selenocysteine is a non-essential amino acid.

  1. Only P

  2. P and Q

  3. Q and R

  4. R and S

  5. Only S
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option as both the statements are correct. Mucilage is one of the examples of soluble dietary fibers. Soluble fiber dissolves in water to form a gel-like material. It can help lower blood cholesterol and glucose levels. Nigerose is composed of two glucose monomer units.

Multiple choice

Among the following carbohydrates, the monosaccharide found in bacterial glycolipids is

  1. nigerose

  2. lyxose

  3. laminaribiose

  4. sophorose

  5. galactose
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. Lyxose is an aldopentose monosaccharide containing five carbon atoms and including an aldehyde functional group. It has chemical formula C5H10O5. It is a C-2 carbon epimer of the sugar Xylose. Lyxose occurs only rarely in nature, for example, as a component of bacterial glycolipids.

Multiple choice

Which of the following statements is/are false regarding carbohydrates?

P. Rings with five and six atoms monosaccharides are called pyranose and furanose forms, respectively. Q. In polysaccharides, monosaccharide units are joined by peptide bond. R. In humans, carbohydrate is stored in liver in the form of glycogen.

  1. Only P

  2. Only Q

  3. Only R

  4. P and Q

  5. Q and R
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct answer. Monosaccharides are the major source of fuel for metabolism, being used both as an energy source (glucose being the most important in nature) and in biosynthesis. When monosaccharides are not immediately needed by many cells they are often converted to more space-efficient forms, often polysaccharides. In many animals, including humans, this storage form is glycogen, especially in liver and muscle cells.

Multiple choice

Which of the following is the simplest form of carbohydrates?

  1. Monosaccharides

  2. Disaccharides

  3. Polysaccharides

  4. Saccharides
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Monosaccharides are the simplest carbohydrates, consisting of a single sugar unit like glucose or fructose. Disaccharides contain two sugar units, while polysaccharides are complex chains of many units. 'Saccharides' is merely a general term for sugars, not a specific carbohydrate type.

Multiple choice

Which of the following carbohydrates is called milk sugar?

  1. Maltose

  2. Lactose

  3. Glucose

  4. Sucrose
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lactose is the specific sugar found in milk, making it the 'milk sugar'. It is a disaccharide composed of glucose and galactose. Maltose is malt sugar, sucrose is table sugar, and glucose is a simple sugar found in many foods but not specifically called 'milk sugar'.