Ich2106:Biochemistry I Question Paper
Ich2106:Biochemistry I
Course:Bachelor Of Science In Public Health
Institution: Meru University Of Science And Technology question papers
Exam Year:2011
SECTION A – Answer all questions
QUESTION ONE (30 MARKS)
a) i) Name the three components of nucleotides. (3 Marks) ii) State the difference between DNA and RNA in terms of nitrogenous base composition. (2 Marks)
b) Describe with aid of a diagram the structural features of a bacterial cell. (5 Marks) c) i) Name any two trace elements in living organisms. (1 Mark) ii) Name the four most abundant elements in living organisms. (4 Marks) d)
i. Name the functional groups represented by x, y and z. (3 Marks) ii. Draw the structure of the following functional groups. (i) Methyl (ii) Ester (2 Marks) e) i) Explain what enzymes are. (1 Mark) ii) State the meaning of the following terms. (4 Marks) (i) Active site
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(ii) Substrate (iii)Activation energy (iv) Rate – limiting step f) i) Name the three thermodynamic quantities describing energy changes occurring in chemical reactions. (3 Marks) ii) Differentiate an exothermic from an endothermic reaction. (2 Marks)
SECTION B
Answer any two questions
QUESTION TWO (20 MARKS)
a) Describe and illustrate various types of transport across biological membranes. (10 Marks) b) Illustrate with the aid of a labeled diagram the fluid mosaic model of a biological membrane structure. (10 Marks)
QUESTION THREE (20 MARKS)
a) Name the three size classes of carbohydrates providing an example in each case. (6 Marks) b) Explain the reaction in which maltose (disaccharide) is formed. (12 Marks) c) State the type of bond that joins two monosaccharides to form a disaccharide. (2 Marks)
QUESTION FOUR (20 MARKS)
a) Name the classes of the 20 common amino acids. ( 5 Marks) b) Draw the structures of the following amino acids. (6 Marks) i. Glycine ii. Alanine iii. Phenylalanine c) Show the reaction in which cystine is formed. (9 Marks)
QUESTION FIVE (20 MARKS)
a) State the difference between saturated and unsaturated fatty acids, providing an example in each case. (3 Marks) b) Name the five general types of membrane lipids. (5 Marks) c) Draw the structures of the following head groups of glycerophospholipids. (8 Marks) i. Glycerol ii. Serine iii. Ethanolamine iv. Choline d) State the corresponding name of the glycerophospholipids with head groups in C above. (4 Marks)
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