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Biomolecules: CBSE Class 11 NCERT Solution

Aug 7, 2015 18:09 IST

    Find the CBSE Class 11 Biology NCERT Solution for the Chapter- 9, Biomolecules. It has been framed keeping the Students' perspective in mind. This will help the Students with easy and simple understanding of the concept and technique employed in solving as per the CBSE Marking Scheme.

    To get the Complete NCERT Solution, Click Here

    Few Sample Question from this Chapter are given below:

    Q. What are macromolecules? Give examples.

    Ans. The large complex molecules having molecular weights more than one thousand Dalton which occur in colloidal state in the intercellular fluid are called macromolecules. They are formed by the polymerization of low molecular weight micromolecules. For example: Polysaccharides, proteins, lipids, etc.

    Q. What is meant by tertiary structure of proteins?

    Ans. The long protein chain undergoes coiling and folding and gives rise to a complex three-dimensional shape referred to as tertiary structure of proteins. These coils and folds are arranged to hide the non-polar amino acid chains and to expose the polar side chains.

    Q. Proteins have primary structure. If you are given a method to know which amino acid is at either of the two termini (ends) of a protein, can you connect this information to purity or homogeneity of a protein?

    Ans. Yes, if we are provided with a method to know the sequence of proteins, we can check its purity by comparing its structure with any of the known correct protein sequence. If the same amino acid is present at both ends of protein, then it is a homopolymer. In this case, the protein is not pure. On the other hand, a heteropolymer is a pure protein.

    Q. Can you describe what happens when milk is converted into curd or yoghurt from your understanding of proteins.

    Ans. Milk contains a protein named casein that constitutes nearly 80% of the milk. Casein is of high nutritional value. It also gives milk its characteristic white colour. The curd is formed due to the chemical reaction taking place between casein and lactic acid. When curd is added to milk, the bacteria present in the lactic acid cause coagulation of casein, hence gives rise to the formation of curd.

    Q. What are gums made of? Is Fevicol different?

    Ans. Natural gums are made up polysaccharides. Fevicol is different from natural gums as it is a synthetic gum. It is not a polysaccharide but a polyvinyl alcohol (PVA).

    To get the Complete NCERT Solution, Click Here

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