The amino acid (S)-alanine has the physical characteristics listed under the structure.ÇOOHa. What is the melting point of (R)-alanine?b. How does the melting point of a racemic mixture of (R)- and (S)-alaninecompare to the melting point of (S)-alanine?c. What is the specific rotation of (A)-alanine, recorded under the sameconditions as the reported rotation of (S)-alanine?d. What is the optical rotation of a racemic mixture of (R)- and (S)-alanine?e. Label each of the following as optically active or inactive: a solution of pure(S)-alanine; an equal mixture of (R)- and (S)-alanine; a solution that contains75% (S)- and 25% (R)-alanine.CHNH2(S)-alanine[a) = +8.5mp = 297 °C

Stereoisomers are defined as the compound having the same molecular formula and the connectivity…

Answered: The amino acid (S)-alanine has the…

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter28: Nucleic Acids

Section: Chapter Questions

Problem 28.20P

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The amino acid (S)-alanine has the physical characteristics listed under the structure. a.What is the melting point of (R)-alanine? b.How does the melting point of a racemic mixture of (R)- and (S)-alanine compare to the melting point of (S)-alanine? c. What is the specific rotation of (R)-alanine, recorded under the same conditions as the reported rotation of (S)-alanine? d.What is the optical rotation of a racemic mixture of (R)- and (S)-alanine? e.Label each of the following as optically active or inactive: a solution of pure (S)alanine; an equal mixture of (R)- and (S)-alanine; a solution that contains 75% (S)- and 25% (R)-alanine.
The amino acid (S)-alanine has the physical characteristics listed under the structure. a. What is the melting point of (R)-alanine? b. How does the melting point of a racemic mixture of (R)- and (S)-alanine compare to the melting point of (S)-alanine? c. What is the specific rotation of (R)-alanine, recorded under the same conditions as the reported rotation of (S)-alanine? d. What is the optical rotation of a racemic mixture of (R)- and (S)-alanine? e. Label each of the following as optically active or inactive: a solution of pure (S)- alanine; an equal mixture of (R)- and (S)-alanine; a solution that contains 75% (S)- and 25% (R)-alanine. HO, NH2 (S)-alanine [a] = +8.5 mp = 297 °C
The amino acid (S)-alanine has the physical characteristics listed under the structure. What is the optical rotation of a racemic mixture of (R)- and (S)-alanine?
Assume that some protein molecule, in its folded native state, has one favored conformation. But, when it is denatured, it becomes a “random coil,” with many possible conformations. (a) What must be the sign of DS for the change: native à denatured? (b) How will the contribution of DS for native denatured affect the favorability of the process? What apparent requirement does this impose on DH if proteins are to be stable structures?
In the structures of T—A and C—G base pairs, there are three amino groups specifically labeled as “sp2 hybridized and planar”. What is the primary difference between these structures and that of aniline that lead to their planarity? 1. In contrast to aniline, the amino groups on the DNA bases are necessary to make the heterocyclic rings aromatic. 2. In contrast to aniline, the contributing structures that delocalize the nitrogen lone pairs onto the rings creates partial negative charges on electronegative atoms. 3. In contrast to aniline, the hydrogen bond accepting ability of the lone pairs on the -NH2 groups of the DNA bases is better when these amino groups are sp2 hybridized. 4. Both 2 and 3.
b. In the human body, cysteine is oxidized to cystine, a disulfide. Draw a structural formula for cystine. O o You do not have to consider stereochemistry. o You do not have to include lone pairs in your answer. o You do not have to explicitly draw H atoms. 11... / ▼ n [F ? Ⓡ ChemDoodle
Most naturally occurring amino acids have chiral centers (the asymmetric a carbon atoms)that are named (S) by the Cahn–Ingold–Prelog convention (Section 5-3). The commonnaturally occurring form of cysteine has a chiral center that is named (R), however.(a) What is the relationship between (R)-cysteine and (S)-alanine? Do they have the oppositethree-dimensional configuration (as the names might suggest) or the same configuration?(b) (S)-Alanine is an l-amino acid (Figure 24-2). Is (R)-cysteine a d-amino acid or anl-amino acid?
Explain the solubility behavior of each compound in water with relevance to their STRUCTURE. c. Amino Acids and Proteins in Water-Alanine (clear colorless solution)-Glutamic acid (clear colorless solution)-Arginine (clear colorless solution)-Albumin (clear colorless solution)-Casein (clear colorless solution)
Parallel and anti-parallel beta sheets are found in proteins, but more often the latter. This is because: a. Hydrogen bonds are intermolecular in parallel, vs intramolecular for anti-parallel b. Hydrophobic interactions are the primary mode of stabilization in anti-parallel. c. The hydrogen bonding pattern is different in anti-parallel, and more directionally stabilized than parallel. d. Parallel beta sheets are only found in membrane proteins. e. None of the above 22. Which of the following is most likely to destabilize a beta sheet? A. Leu B. Asn C. Pro D. Ser E. Ala 23. lon exchange chromatography separates proteins based on a. pH b. mass c. charge d. hydrophobicity e. none of the above 24. Four proteins, 1 (MW 30,000), 2 (MW 275,000), 3 (MW 10,000) and 4 (MW 55,000) are separated by gel filtration chromatography. The order of elution from the column will be: a. 1, 2, 3, 4 b. 2, 1,4,3 c. 3,1,4,2 d. 2,4,1,3 e. 2,1,3,4 25. Four proteins, 1 (pl 5), 2 (pl 9.8), 3 (pl 7) and 4 (pl 5.7)…
Parallel and anti-parallel beta sheets are found in proteins, but more often the latter. This is because: a. Hydrogen bonds are intermolecular in parallel, vs intramolecular for anti-parallel b. Hydrophobic interactions are the primary mode of stabilization in anti-parallel. c. The hydrogen bonding pattern is different in anti-parallel, and more directionally stabilized than parallel. d. Parallel beta sheets are only found in membrane proteins. e. None of the above , Which of the following is most likely to destabilize a bet A. Leu B. Asn C. Pro Ser Ala
C. Trehalose and isomaltose are both dimers of glucose. However, they have considerably different reactivities. Concisely explain why these differences are observed. OH HO но но. HO HO OH Но- он но OH HO НО trehalose isomaltose 1. Isomaltose is a reducing sugar while trehalose is not. 2. Trehalose is very resistant to acid hydrolysis while isomaltose can be acid-hydrolyzed with ease.
Problem 5.31 The amino acid (S)-alanine has the physical characteristics listed under the structure. a. What is the melting point of (R)-alanine? b. How does the melting point of a racemic mixture of (R)- and (S)-alanine compare to the melting point of (S)-alanine? c. What is the specific rotation of (R)-alanine, recorded under the same conditions as the reported rotation of (S)-alanine? d. What is the optical rotation of a racemic mixture of (R)- and (S)-alanine? e. Label each of the following as optically active or inactive: a solution of pure (S)- alanine; an equal mixture of (R)- and (S)-alanine; a solution that contains 75% (S)- and 25% (R)-alanine. HO, NH2 (S)-alanine [a] = +8.5 mp = 297 °C

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