NCERT Solutions for Class 11 Biology Chapter 9

Biomolecules Class 11

Chapter 9 Biomolecules Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 160

Q1 :  

What are macromolecules? Give examples.


Answer :

Macromolecules are large complex molecules that occur in colloidal state in intercellular fluid. They are formed by the polymerization of low molecular weight micromolecules.

Polysaccharides, proteins, and nucleic acids are common examples of macromolecules.

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Q2 :  

Illustrate a glycosidic, peptide and a phospho-diester bond.


Answer :

(a)

Glycosidic bond is formed normally between carbon atoms, 1 and 4, of neighbouring monosaccharide units.

(b)

Peptide bond is a covalent bond that joins the two amino acids by - NH - CO linkage.

(c)

Phosphodiester bond is a strong covalent bond between phosphate and two sugar groups. Such bonds form the sugar phosphate backbone of nucleic acids.

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Q3 :  

What is meant by tertiary structure of proteins?


Answer :

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Q4 :  

Find and write down structures of 10 interesting small molecular weight

biomolecules. Find if there is any industry which manufactures the compounds

by isolation. Find out who are the buyers.


Answer :

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Q5 :  

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?


Answer :

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Q6 :  

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?


Answer :

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Q7 :  

Find out and make a list of proteins used as therapeutic agents. Find other applications of proteins (e.g., cosmetics, etc.)


Answer :

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Q8 :  

Explain the composition of triglyceride.


Answer :

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Q9 :  

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


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Q10 :  

Can you attempt building models of biomolecules using commercially available atomic models (Ball and Stick models).


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Q11 :  

Attempt titrating an amino acid against a weak base and discover the number of dissociating ( ionizable ) functional groups in the amino acid.


Answer :

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Q12 :  

Draw the structure of the amino acid, alanine.


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Q13 :  

What are gums made of? Is Fevicol different?


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Q14 :  

Find out a qualitative test for proteins, fats and oils, amino acids and test any fruit juice, saliva, sweat and urine for them.


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Q15 :  

Find out how much cellulose is made by all the plants in the biosphere and compare it with how much of paper is manufactured by man and hence what is the consumption of plant material by man annually. What a loss of vegetation!


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Q16 :  

Describe the important properties of enzymes.


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<< Previous Chapter 8 : Cell : The Unit of Life Next Chapter 10 : Cell Cycle and Cell Division >>

Biology : CBSE NCERT Exercise Solutions for Class 11th for Biomolecules will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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