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Chapter 28: Q28-10P (page 954)
What is the base sequence in the original DNA strand on which the mRNA sequence in problem 28-9 was made?
CUU-AUG-GCU-UGG-CCC-UAA
Thebase sequence in the original DNA strand can be written as
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Question: Draw the complete structure of the deoxyribonucleotide sequence from which the mRNA codon in problem 28-29 was transcribed.
Show the steps involved in a laboratory synthesis of the DNA fragmentwith the sequence CTAG.’
One of the steps in the metabolic degradation of guanine in hydrolysis to give xanthine. Propose a mechanism.
Melamine, used as a fire retardant and a component of the writing surface of white boards, can be prepared from s-trichlorotriazine through a series of SNAr reactions with ammonia. The first substitution takes place rapidly at room temperature. The second substitution takes place near 100 °C, and the third substitution requires even higher temperature and pressure. Provide an explanation for this reactivity.
Question: Amine bases in nucleic acids can react with alkylating agents in typical SN2 reactions. Look at the following electrostatic potential maps, and tell which is the better nucleophile, guanine or adenine. The reactive positions in each are indicated.
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