Biology · Chemistry

Carbohydrates and Biomolecules

986 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 carbohydrates is associated with plants?

  1. Glycogen

  2. Chitin

  3. Amylopectin

  4. L-Glucose
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Amylopectin is a soluble polysaccharide and highly branched polymer of glucose found in plants. It is one of the two components of starch, the other being amylose and is associated with plants.

Multiple choice

Which of following statements is correct about carbohydrate portion of cell membrane?

  1. It provides to polycationic charge on extracellular surface.

  2. It has a symmetrical distribution.

  3. It is present primarily in kind of free saccharides groups.

  4. It produces glycocalyx composed of glycolipids and glycoproteins.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Carbohydrate portion of cell membrane produces glycocalyx composed of glycolipids and glycoproteins.

Multiple choice

Which polysaccharide is the major constituent of fungal cell wall?

  1. Lignin

  2. Cellulose

  3. Pectin

  4. Chitin

  5. Hemicellulose
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fungi possess cell walls made of the glucosamine polymer 'chitin'. It is a polymer of nitrogen-containing polysaccharide rendering a tough protective covering or structural support in certain organisms.

Multiple choice

Which is the most common hemicellulose present in the primary cell wall of plants?

  1. Xyloglucan

  2. Xylan

  3. Glucuronarabinoxylan

  4. Cutin

  5. Suberin

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

Xyloglucans are the main hemicellulosic polysaccharides found in the primary cell walls of dicots and non-graminaceous monocots. Xyloglucan and cellulose together make up about two-thirds of the dry weight of primary cell walls and is the major tension bearing components of the matrix. 

Multiple choice

Which of the following is not a property of Lacasses?

  1. Lacasses are glycoproteins which are ubiquitous in nature

  2. Lacasses are a group of reductive enzymes

  3. Lacasses produce dimers and oligomers as reaction products when they are used in organic synthesis with substrates like phenols and amines

  4. Their uses extend from the textile to pulp and paper industry
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because Lacasses are a group of oxidative enzymes as they catalyze monoeletronic oxidation of substrates as the expense of molecular oxygen.

Multiple choice

Which of the following compounds is not present in dietary fibre?

  1. Cellulose

  2. Hemicellulose

  3. Cholesterol

  4. Beta-glucans

  5. Pectin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cholesterol is needed to construct the important membranes which surround cells. The body is able to manufacture cholesterol but is unable to destroy this substance. Cholesterol is removed from the body combined with bile acids. This removal is increased by dietary fibre and diminished in the absence of dietary fibre.

Multiple choice

Which of the following is/are converted to simple carbohydrates during digestion?

  1. Molasses

  2. Honey

  3. Alcohol

  4. White rice

  5. Peas
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Complex carbohydrates are formed from three or more sugar molecules but the sugar molecules are strung together to form longer, more complex chains. Complex carbohydrates include fibre and starch. Foods rich in complex carbohydrates include vegetables, whole grains, peas and beans. They are loaded with fibre, vitamins, minerals and micronutrients. During digestion, these complex carbohydrates are cleaved into single 6 carbon molecular units. Then they are absorbed and transported to the cells in the blood. These sugar molecules are either metabolized immediately to provide energy for the cell or stored in liver and muscle cells as glycogen to be used for future energy needs.

Multiple choice

Which of these is one of the major carbohydrates other than cellulose and hemicellulose present in the primary growing plant cell wall?

  1. Lignin

  2. Chitin

  3. Silica

  4. Glycoproteins

  5. Pectin
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

In the primary (growing) plant cell wall, the major carbohydrates are cellulose, hemicellulose and pectin. The cellulose microfibrils are linked via hemicellulosic tethers to form the cellulose-hemicellulose network, which is embedded in the pectin matrix.

Multiple choice

Which polysaccharide is the major constituent of fungal cell wall?

  1. Lignin

  2. Cellulose

  3. Pectin

  4. Chitin

  5. Hemicellulose
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fungi possess cell walls made of the glucosamine polymer chitin. It is a polymer of nitrogen-containing polysaccharide rendering a tough protective covering or structural support in certain organisms.