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Concept explainers
(a)
Interpretation: The hydrophobic interaction is whether a covalent bond or noncovalent interaction has to be stated.
Concept introduction: The hydrophobic interaction exists between the nonpolar R groups of the amino acids. In aqueous solvent, the nonpolar side chains of the amino acids point inwards, that is away from the polar water molecules.
(b)
Interpretation: The hydrogen bond is whether a covalent bond or noncovalent interaction has to be stated.
Concept introduction: The hydrogen bond exists between the polar R groups of the amino acids. Different polar side chains, mostly that have a
(c)
Interpretation: The disulphide bond is whether a covalent bond or noncovalent interaction has to be stated.
Concept introduction: The disulphide bond exists between the
(d)
Interpretation: The electrostatic interaction is whether a covalent bond or noncovalent interaction has to be stated.
Concept introduction: The electrostatic interaction exists between the acidic R group of an amino acid and the basic R group of the other amino acid. The acidic side chain becomes negatively charged and the basic side chain becomes positively charge at an apt pH.
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Chapter 20 Solutions
EBK GENERAL, ORGANIC, AND BIOLOGICAL CH
- For the first part, draw a Fischer projection formula for the enantiomer of each of the following monosaccharides. For the second part, identify whether the images are in D- or L-configuration. Write your answers first on a piece of bond paper.arrow_forwardWhat is the contribution of dilsulfide bonds in proteins?Which groups or side chain participate in these reactions? Discuss with examples in detail.arrow_forwardIdentify all of the chirality centers in the structure. The chirality centers are: A В C D `NH E F OH b H Он I J K L M N P Q Rarrow_forward
- Why are disulfide bonds particularly important and unique in their role as determinants of tertiary structure?arrow_forwardFor A, B, C, D, E, F, identify the circled functional groups and linkages in the compound in the picture.arrow_forwardWhen Alfred Werner was developing the field of coordination chemistry, it was argued by some that the optical activity he observed in the chiral complexes he had prepared was due to the presence of carbon atoms in themolecule. To disprove this argument, Werner synthesized a chiral complex of cobalt that had no carbon atoms in it, and he was able to resolve it into its enantiomers. Design a cobalt(III) complex that would be chiral if it could be synthesized and that contains no carbon atoms.arrow_forward
- Does trehalose (Problem 20.68) have an acetal grouping? A hemiacetal grouping? Do you expect trehalose to be a reducing or nonreducing sugar? Classify the linkage between the two monosaccharides.arrow_forwardDraw the structures and indicate the net charge of the following amino acids for each pH value. Encircle the structure of the zwitterion and calculate for the pI. 1. Tyr (at pH: 1.5, 7.0, 9.5, and 11.0)2. Ser (at pH: 1.5, 7.0, and 9.5)arrow_forwardHow many moles of EDTA (C10H16N2O3) do you have in 785µl of a 74MM EDTA solution (Mr(C10H16N203) = 292.24)? Consider all digits of your Givens significant. Round results to the appropriate number of Significant Digits. The number of moles is mmol.arrow_forward
- The PI of protein P is 7.3. One can purify protein P by: Anion-exchange chromatography at pH 2.0 Anion-exchange chromatography at pH 7.3 Anion-exchange chromatography at pH 9.0 Anion-exchange chromatography at pH 4.3arrow_forwardWhat is the functional groups:arrow_forwardWhich of the following define the stereochemistry of alanine (as per the structure shown)? Note: Functional groups arranged horizontally are facing towards the front, and the functional groups arranged vertically are facing towards the back. СООН + H₂N to OS- Od- CH, OR-arrow_forward
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