Biochemistry of Carbohydrates and Lipids — DU B. Sc. (Hons) Microbiology Previous Year Question Papers

5. (a) Explain why do the amphipathic lipid molecules form a bilayer structure? How does a bilayer differ from a monolayer? (3+3=6) (b) Glycogen with n branches have an nt1 non-reducing end and one reducing end. Explain. (c) Explain the laws of thermodynamics with examples. (7) 6. (a) What feature of Archeal membrane lipids help them to survive in extreme environments. (6) (b) Define Gibbs free energy and comment on exergonic and endergonic reactions. (c) Explain with an example how a thermodynamically unfavorable reaction can be driven in the forward direction. (6) 1. (a) Give an example of the following and draw their biochemical structures (any three) : (3x5=15) (i) Non reducing disaccharide (ii) Sugar derivative in fungal cell wall (iii) Epimer (iv) Essential fatty acid (b) Define entropy and enthalpy. Write a mathematical expression relating these two terms. (1+2=3) 2. (a) Differentiate between the following (any three) : (i) Starch and Cellulose (ii) Enantiomers and Diastereoisomers (iv) Standard free energy change and Actual free energy change (b) What are anomers. Discuss giving an example. (a) State true or false giving reason/s (any four) : (ii) All sugars are optically active (iii) All monosaccharides are reducing in nature (iv) Oleic acid is a polyunsaturated fatty acid (v) Lipids are better storage fuel than carbohydrates (b) Discuss how is free energy change of a chemical reaction related to the concentration of its reactants and products. (6) 4. (a) Write short note on the following (any three) : (i) Energy rich compound (iii) Mutarotation (b) What is pectin? Give its function: (1+2=3)