BSc Biochemistry Sem I 2018 19 2018-19 FYBIO CHEM Biochemistry I Question Paper - Mumbai University | munotes

Questions asked in this paper

• (ii) Figures to the right indicate full marks

1. Q1 A State True or False: 4 marks
   • (i) Bases are proton acceptors
   • (ii) In water, non-polar molecules precipitate
   • (iii) It take less time to boil an egg on Mount Everest than in Mumbai
   • (iv) Gastric juice is more acidic than milk
2. Q1 B) Give reasons for: (Any three) 9 marks
   • (i) When a lake freezes, animals underwater live comfortably
   • (ii) H+ concentration gives an idea about pH of a solution
   • (iii) N2 is water soluble
   • (iv) Butane and butanol both are able to form hydrogen bonds
   • (v) Mercury has a convex meniscus
   • (vi) Bicarbonate buffer is made up of two components
3. Q1 C) Answer the following: (Any two) 12 marks
   • (i) With a suitable diagram, explain the molecular structure of water molecule. Explain why charged solutes like NaCl are readily soluble in water
   • (ii) Write a note on ionisation of water
   • (iii) Why are buffers important in the human body? Explain phosphate buffer as a
   • (iv) Define Normality. How many grams of solid NaOH will be required to prepare 850ml of 1.5 M NaOH solution? Express your answer in terms of Normality and g/lit
4. Q2 A State True or False: 4 marks
   • (i) Phenylalanine is an imino acid
   • (ii) Haemoglobin is a transport protein
   • (iii) Peptide bond is a disulfide bond
   • (iv) Silk fibroin consists of polypeptide chains arranged in a a helix
5. Q2 B) Give reasons for: (Any three) 9 marks
   • (i) Amino acids are zwitterions
   • (ii) Isoleucine has two chiral carbons
   • (iv) Isoelectric pH of leucine is 6. At pH 10 it exists as anion
   • (v) Gelatin is an example of an incomplete protein
   • (vi) Denaturation only affects the secondary structure
6. Q2 C) Answer the following: (Any two) 12 marks
   • (i) Justify the given statement: ‘Amino acids can be classified into different groups based on polarity’
   • (ii)Explain the four levels of protein structural organization
   • (iii) What are Enantiomers? Write the structures of D- and L-Serine
   • (iv) Write an elaborate note on simple, conjugated and derived proteins
7. Q3 A) State True or False: 4 marks
   • (i) Hyaluronic acid has ONLY 3
   • (iii) Formation of stable ring structure of glucose involves Cl and C2
   • (iv)Reaction of ketone group with hydroxyl group leads to formation of hemiketal
8. Q3 B) Answer the following: (Any three) 9 marks
   • (i) State True or False, giving reasons: “Glucose and galactose gives the same
   • (ii) Write a detailed note on stereoisomerism in carbohydrates. How many isomers will a sugar having three asymmetric carbons have?
   • (iii) With the help of reaction, explain the “Lobry de bruyn Alberda Van Ekenstein
   • (iv) Justify in detail: “Carbohydrates have diverse functions”
   • (v) Giving reactions, explain the difference between Aldonic, aldaric and uronic acids
   • (vi) Discuss the structure, monomeric units and function of glycogen
9. Q3 C) Answer the following: (Any two) 12 marks
   • (i) Draw the Haworth projections of alpha and beta-glucose. Also, specify the anomeric carbon. Explain the conversion of a to B anomers
   • (ii) Explain the disaccharide lactose under the following headings:
   • a) Structure b) Type of linkage/bond c) Occurrence
   • d) Characteristic properties
   • (iii) Elaborate on the similarities and differences between cellulose and hyaluronic acid
   • (iii) With the help of structures, explain the reaction of (a) glucose with phenylhydrazine
   • (b) Ribose with Orcinol
10. Q4 A) Define the following: (Any five) 10 marks
11. Q4 B) Answer the following: (Any three) 15 marks
    • (i) Explain the significance of the carbohydrate present in sweet potato. Also, add a note on the action of amylases on it
    • (ii) Compare and contrast Maltose and Sucrose, under the following headings:
    • (iii) Elaborate on any two chemical reactions of amino acids
    • (iv) Explain the role of entropy in the dissolution of solutes in water
    • (v) Classify proteins based on shape and function
    • (vi) Between acetone and water, which one is a universal solvent? Give reasons for

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