Sbh2150:Introduction To Biochemistry Question Paper
Sbh2150:Introduction To Biochemistry
Course:Bachelor Of Crop Protection
Institution: Meru University Of Science And Technology question papers
Exam Year:2012
QUESTION ONE - (30 MARKS)
a) Define the following terms: (4 Marks) i. Exergonic reaction ii. nucleotide b) Fill the blanks in the question below. (6 Marks)
Polymer Monomer Type of bond Carbohydrate Protein DNA
c) What are the four main chemical composition of the human body? (4 Marks) d) Name two types of nitrogenous bases that constitute. (4 Marks) i. Pyrimidines ii. Purines e) Draw a labeled diagram showing the lock and key model of enzyme activity. (5 Marks) f) Amino acids exhibit isomerism in their three dimensional structure. Name the two isomers. (2 Marks) g) Amino acids in proteins exhibit which type of isomer. (1 Mark) h) Name two standard amino acids showing the 3-letter abbreviation. (4 Marks)
2
SECTION B
QUESTION TWO (20 MARKS)
a) Define an enzyme. (2 Marks) b) How do enzymes increase the rate of a chemical reaction? (3 Marks) c) Draw and label the Boltzmann distribution and energy profile diagram of an enzyme catalyzed and uncatalyzed reaction ?? + ?? ? ??. (10 Marks) d) List five types of enzyme inhibition. (5 Marks)
QUESTION THREE (20 MARKS)
Use your knowledge of nucleic acid to answer the following questions.
a) Draw and label the structure of a nucleotide. (4 Marks) b) What is the main function of DNA? (2 Marks) c) List three differences between DNA and RNA. (3 Marks) d) List four properties of Watson and Crick model of DNA. (8 Marks) e) DNA has directionality using a diagram explain the two ends. (3 Marks)
QUESTION FOUR (20 MARKS)
Use your knowledge of lipids and fats to answer the following questions:
a) Define a lipid (3 Marks) b) List three main functions of lipids (3 Marks) c) List four types of lipids based on their chemical composition. (4 Marks)
Use the diagram below to answer the following questions:
d) Identify this compound or the class the compound belongs to. (3 Marks) e) What are the two sub units labeled A and B which form this compound. (3 Marks) f) Differentiate between saturated and unsaturated fatty acid. (2 Marks) g) What is the main function of this class of lipids in the body? (2 Marks)
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