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Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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
Transcribed Image Text:6. Using the charges you calculated above, plot the characteristics of alanine over a range of pH
values. Connect the points by estimating what the charge should be at pH values where you
lack data. It is possible to calculate the charge at any pH, but if you understand the
relationships presented here you will be able to make estimates quickly and easily.
+2
+1.5
+1 -
+0.5-
-0.5 -
-1-
-1.5 -
7.
6.
11
13
14
pH of solution
7. Aspartic acid has a side chain bearing a carboxylic acid group; its pK, is 4. The a-amino and
a-carboxylic groups have pKa values similar to those of alanine. Determine the net charge
on aspartic acid at the following pH values:
pH 1
pH 2
pH 4
pH 9
pH 13
Net charge of molecules
2.
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- 5. Refer to Model 2 for information relevant to this question. A sample of the peptide Lys-Glu-Ser has a net charge of zero between what two pH values? What is the pl of Lys-Glu-Ser? Model 2: The pl of a peptide is determined by examining the ionizable groups. The protonated and unprotonated forms of each ionizable group are in equilibrium. Consider the peptide Lys-Glu-Ser shown below at pH 7.2. The complete structure is on on the left and a stylized structure with just the ionizable groups is on the right. While the N-terminal is depicted as protonated, a sample of Lys-Glu-Ser is composed of a population of molecules and within that population some molecules contain a non-protonated N-terminal group at pH 7.2. may H3N* COO- H3N-CH-CIN-CH C N-CH C- H. pK 3.5 OH H. pK= 8.5 COO- CH2 CH2 CH2 NH, pK 10.0 pK 4.2 CH2 CH2 OH CH2 c=0arrow_forwardWhich of the amino acid side-chains would you expect to be protonated (i.e. has not lost its proton) under neutral pH conditions? Include reasons supporting your prediction.arrow_forwardConsider this structure. NH₂ N N O P O N N Part 1 of 3 HO Identify the monosaccharide. Select the single best answer. D-ribose D-2-deoxyribose Part: 1/3 Part 2 of 3 Identify the base. Select the single best answer. Othymine O guanine ○ cytosine adenine uracilarrow_forward
- Can you please explain how to solve this problem?arrow_forwardWould each of the following ions of serine exist at a pH above, below, or at its pI? Drag the appropriate items to their respective bins. Above pl H₂N-CH-COO CH₂OH H₂N-CH-COOH CH₂OH Below pl H₂N-CH-COO CH₂OH At its pl Reset Helparrow_forward2) Consider the following disaccharide which was formed from the breakdown of a polysaccharide found in plant material. ОН Glycosidic linkage: H H OH H H НО H H. OH H. ОН OH H НО H ОН a. Label the glycosidic linkage above in the following format: a/B(# → #) b. Would you expect this disaccharide to have been formed from amylose or amylopectin? c. Describe at least two chemical tests that would give insight into the structure of this disaccharide, assuming you've isolated it and wanted to elucidate the structure from scratch. Include detail on not only the tests you would use but what results you would expect to get given the structure above. Assume you can analyze the structure of any monosaccharide you get from your chemical tests.arrow_forward
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