Question:

Cellulose present in plants and as a food for cattle but not for human beings because

Updated On: Jul 6, 2022
  • human body does not contain cellulase hence cellulose cannot be broken into $D$-glucose
  • human saliva cannot break down plant cellulose in small pieces
  • bile juice present in cattle helps them to digest cellulose
  • human beings have a smaller stomach than cattle.
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The Correct Option is A

Solution and Explanation

The enzyme cellulase present in the stomach of catde breaks cellulose into $D$-glucose and is easily digested. But, it is not present in the human body hence cellulose cannot be broken down into $D$-glucose in human body and cannot act as food for human beings.
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Notes on Biomolecules

Concepts Used:

Biomolecules

Biomolecules are the most essential organic molecules, which are involved in the maintenance and metabolic processes of living organisms. These non-living molecules are the actual foot-soldiers of the battle of sustenance of life.

There are four major classes of Biomolecules –  Carbohydrates, Proteins, Nucleic acids and Lipids.

  1. Carbohydrates are chemically defined as polyhydroxy aldehydes or ketones or compounds which produce them on hydrolysis.
  2. Proteins are another class of indispensable biomolecules, which make up around 50per cent of the cellular dry weight. Proteins are polymers of amino acids arranged in the form of polypeptide chains. The structure of proteins is classified as primary, secondary, tertiary and quaternary in some cases.
  3. Nucleic acids refer to the genetic material found in the cell that carries all the hereditary information from parents to progeny. There are two types of nucleic acids namely, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The main function of nucleic acid is the transfer of genetic information and synthesis of proteins by processes known as translation and transcription.
  4. Lipids are organic substances that are insoluble in water, soluble in organic solvents, are related to fatty acids and are utilized by the living cell.