YABA COLLEGE OF TECHNOLOGY
SCHOOL OF SCIENCE
DEPARTMENT OF CHEMICAL SCIENCE
2° SEMESTER EEXAMINATIONS 2017/2018 SESSION
CLASS ND II (PT) SCIENCE LAB. TECH
PAPER CODE: STC222
COURSE TITLE: INTRODUCTORY BIOCHEMISTRY
INSTRUCTION: There should be no jotting, writting or any other inscription on your question paper, except name and registration number where necessary.
PHONE, MOBLE DEVICE AND BAGS ARE PROHIBITED IN THE EKAVIINATION HAL ATTEMPT I QUESTIONS IN SECTION A AND AA IN SECTIONE.
TIME: 2 HRS
COURSE UNIT: 2
SECTION A
1a) Write short notes on the six classes of enzymes (12mks)
b) List three functions of protein (3mks)
2) List any six different elasses of amino acids and draw the structure of one examp.e of each class (15mks)
3) (a) List 2 biological functions of water in biological system (4 mks)
(b) Derive the Handerson-Hasselbalch equation when acid HX ionizes in solution
(c) Calculate the PH of a solution of (i) 10⁵ M HC1 (i) Calculate the [H']
concentration of gastric juice whose PH is 4.0 (4 mks)
(4) (a) What are Non reducing sugars ? Give 2 examples (5 mks)
(b) Describe any 4 properties of monosaccharide (10 mks)
(5) (a) What are buffers ? Give 3 examples biological buffers (5 mks)
(b) Describe any 2 of the following (i) Sucrose (ii) Maltose (iii) Lactosc (10 mks)
SECTION B
Attempt all questions In Section B
1. What is a pure water?
2. Give 2 biological properties of water
3. Draw the structure of a named pentose sugar
4. Calculate the pH of solution of 10 M HCL
5. List 2 examples physiological buffer
6. List 1 example each of structural and storage polysaccharides
7. Write Michealis-Menten Equation
8. List all the 6 classcs of enzymes
9. Why is sucrose a non-reducing sugar
10. List 2 functions of protein
11. Draw the structure of any Sulphur containing amino acid
12. Define Handerson- IHasselbach equation
13. Draw the structure of a named Hexose sugar