Short answer questions on human DNA, stearic acid, and aldaric acid
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D. Human DNA contains about 30% each of adenine and thymine and about 20% each of guanine and cytosine. The bacteria Clostridium perfringes contains about 37% adenine and thymine and 13% guanine and cytosine. Explain how this information relates to the structure of DNA in general.
5. Stearolic acid (C18H32O2) yields stearic acid on catalytic hydrogenation and odergoes oxidative cleavage with ozone to yield nonanoic and monanedioic acid. What is the structure of stearolic acid? Account for the reactions indicated above. Would this acid have a higher or lower melting point than stearic acid. Explain.
6. Compound A is a D aldopentose that can be oxidized to optically inactive aldaric acid, B. On Kiliani-Fischer chain extension, A is converted into C and D. C can be oxidized to an optically active aldaric acid E, but D is oxidized to an optically inactive aldaric acid F. What are the structures of A-F?
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Solution Summary
The solution provides three short answer responses to a question about human DNA, a question about stearolic acid, a question about aldaric acid.
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Question 5:
What is the structure of stearolic acid. Stearic acid is C18H36O2. Therefore, stearolic acid to be C18H32O2, there are 4 hydrogens missing from the saturated condition. This means that there are either two double bonds or one triple bond. Oxidative cleavage yields two nine-carbon acids. Therefore, stearolic acid must contain one triple bond. If it had two double bonds, oxidative cleavage would have produced three different acids, one cleavage at each double bond, right?
Therefore, we've got the structure. The triple bond occurs right in the middle of the molecule such that when cleaved by oxidation, ...
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