Chapter 24: Problem 57
Draw the structure for 2 -bromo- 2 -chloro- 3 -methylpentane, and indicate any chiral carbons in the molecule.
Chapter 24: Problem 57
Draw the structure for 2 -bromo- 2 -chloro- 3 -methylpentane, and indicate any chiral carbons in the molecule.
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Get started for freeName or write the condensed structural formula for the following compounds: (a) 4 -methyl-2-pentene (b) cis-2,5-dimethyl-3-hexene (c) ortho-dimethylbenzene (d) \(\mathrm{HC} \equiv \mathrm{CCH}_{2} \mathrm{CH}_{3}\) (e) trans-CH \(_{3} \mathrm{CH}=\mathrm{CHCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}\)
Can a DNA strand bind to a complementary RNA strand? Explain.
Adenine and guanine are members of a class of molecules known as purines; they have two rings in their structure. Thymine and cytosine, on the other hand, are pyrimidines, and have only one ring in their structure. Predict which have larger dispersion forces in aqueous solution, the purines or the pyrimidines.
(a) Describe the primary, secondary, and tertiary structures of proteins. (b) Quaternary structures of proteins arise if two or more smaller polypeptides or proteins associate with each other to make an overall much larger protein structure. The association is due to the same hydrogen bonding, electrostatic, and dispersion forces we have seen before. Hemoglobin, the protein used to transport oxygen molecules in our blood, is an example of a protein that has quaternary structure. Hemoglobin is a tetramer; it is made of four smaller polypeptides, two "alphas" and two "betas." (These names do not imply anything about the number of alpha-helices or beta sheets in the individual polypeptides.) What kind of experiments would provide sound evidence that hemoglobin exists as a tetramer and not as one enormous polypeptide chain? You may need to look into the chemical literature to discover techniques that chemists and biochemists use to make these decisions.
The monoanion of adenosine monophosphate (AMP) is an intermediate in phosphate metabolism:where \(A=\) adenosine. If the \(\mathrm{p} K_{a}\) for this anion is \(7.21,\) what is the ratio of \(\left[\mathrm{AMP}-\mathrm{OH}^{-}\right]\) to \(\left[\mathrm{AMP}-\mathrm{O}^{2-}\right]\) in blood at \(\mathrm{pH} 7.4 ?\)
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