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What are the similarities with respect to composition in the four DNA nucleotides?
3. What is the relationship between oxygen existence and production of organic compounds?
what are butter and oil composed of
b) Discuss the relative stabilities of various conformations of 1,3-dimethylcylohexane.
a) Draw sawhorse projections for the most stable and the least stable conformations of
butane.
a) Explain the following giving suitable examples:
i) Enantiomers
ii) Diastereomers
iii) Meso compounds
b) Write the structures of the following compounds:
i) N-ethyl-N-methylmethanamide
ii) 4-Nitro-N-phenylethanamide
b) What are the factors that affect the immune response? Differentiate between the cellular and humoral immunity.
a) Discuss briefly the experiment of Griffith and Avery.
b) Explain the following terms.
i) Termination codons ii) Lac operon
iii) Chemical carcinogens iv) Immobilised enzyme.