IGNOU BCHET-149 June 2022 Previous Year Question Paper

Q1.(a) Name the three domains of life. How do these differ from one another ? Give an example for each domain. 5

(b) Describe how carbohydrates are classified. Give examples for different classes. Write the enantiomeric structures of a carbohydrate with minimum number of carbons.

Q2.(a) Name the amino acid which does not show optical activity and write its zwitterionic structure. Explain the property of amino acids based on their zwitterionic nature. 5

(b) How are proteins classified on the basis of their biological functions ? List any five ways and describe any one in brief.

Q3.(a) What is the difference between the systematic and trivial nomenclature of enzymes ? List the three principles that should be followed in classifying enzymes. 5

(b) Write any five differences between drugs and medicines.

Q4.(a) What are lipids ? List their any three main functions in human body. 5

(b) Write the similarities between DNA replication and RNA transcription.

Q5.(a) “Generation of ATP by glycolysis is unique.” Justify this statement and illustrate your

(b) What are essential fatty acids ? Give an example. How does the length of chain of a fatty acid affect its melting point ?

Q6.(a) Describe the role of ATP as the carrier in biological energy transformations. 5

(b) List the three methods of amino acid sequence determination in peptides. Describe any one of the methods.

Q7.(a) Describe the principles underlying the catalytic activity of enzymes. Illustrate your

(b) Write short notes on any two of the following : 5

(i) Fluid mosaic model of biomembranes

(ii) Metabolic fates of pyruvate

(ii) | Ketone bodies BCHET-149 4 Gi) Fem fis