Which of the following is incorrect about the peptide Val-Leu-Ala-Ser-Gly? It has a net charge of zero at pH 7 Ob. It is a pentapeptide with an estimated MW of 550 Da It does not have amino acids with charged side chains a. c. Od. None; all the other choices are correct
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- Which of the following statements concerning the peptide NH3*-Val-Ala-Gly-Lys-Leu-Gly-Val-Phe- Tyr-lle-COOH is correct? O The peptide can form an alpha-helical secondary structure O The peptide can form a beta-pleated sheet O The last amino acid residue is Val. O Three peptide linkages are present.Which of these amino acids is a polar, uncharged amino acid? (Select all that apply, if necessary.) A. B. D. E. CHLO H₂N-CH-C CH₂ CH₂ CH₂ NH C=NH2 NH₂ amino acid A amino acid C amino acid D amino acid B amino acid E H₂N-CH-C CH₂ _i_g C. H₂N-CH-C- CH2₂ I CH₂ =0 NH₂ H₂N-CH- CH₂ CH-CH3 CH3 H₂ND H₂N-CH- | CH₂ Ï OHWhich of these amino acids is a hydrophobic amino acid? (Select all that apply, if necessary.) A. B. C. D. E. iº H₂N-CH-C CH₂ T CH₂ CH₂ NH C=NH2 NH₂ amino acid E amino acid D amino acid B amino acid C amino acid A 200 H₂N-CH-C CH₂ C=O I OO H₂N-CH-C- CH₂ CH₂ T C=O T NH₂ 0 H₂N-CH- CH₂ CH-CH3 CH3 H₂N-CH-C CH₂ I OH -0
- Indicate which of the amino acid residues in the following peptide sequence contains a group that has a positive charge for its most likely charge state at pH 10. Asp-Tyr-Lys-GIn-Thr-Ile-Phe-Met-Ser (If none of the amino acids fit the criterion, select "none".) Asp Tyr ооооооооо Lys Gln Thr lle Phe Met Ser noneThe amino acid shown below has an ionizable side chain with a pka of 4. When this amino acid is in a more basic solution (i.e., pH 11), it would resemble ionization state C and have a charge of -1 HO OH NH₂ lonization state A NH3 lonization state C HO OH NH3+ Ionization state B dyb NH₂ lonization state DWhich of the following is not true about a-amino acids? have at least 2 pka values O negatively charged at pH = 1.0 most contain one chiral center can act as buffers
- A tetradecapeptide (14 amino acid residues) gives the following peptide fragments on partial hydrolysis. From this information, deduce the primary structure of this polypep- tide. Fragments are grouped according to size. Pentapeptide Fragments Tetrapeptide Fragments Phe-Val-Asn-Gln-His Gln-His-Leu-Cys His-Leu-Cys-Gly-Ser His-Leu-Val-Glu Gly-Ser-His-Leu-Val Leu-Val-Glu-Ala+H₂N-CH-COO™ T CH₂ I CH₂ 1 CH₂ I +H₂N-CH₂ A. O amino acid C amino acid D O amino acid E amino acid B +H₂N-CH-COO™ I CH₂ I CH₂ 1 O amino acid A C=0 B. If the pH decreases enough, this amino acid will become protonated and could contribute to the denaturation of the protein. +H₂N-CH-COO™ 1 CH₂ I OH C. +H₂N-CH-COO™ CH H₂C CH3 D.Which of the following statements best describes the hydrophobic character of bacteriorhodopsin (2BRD)? Both the interior and exterior of the protein are hydrophobic, including the central core of the trimer. Both the interior and exterior of the protein are hydrophilic, including the central core of the trimer. Both the interior and exterior of the protein are hydrophilic, but the central core of the trimer is hydrophobic. Both the interior and exterior of the protein are hydrophobic, but the central core of the trimer is hydrophilic.
- a All amino acids have at least two ionizable groups: an a-amino group (average pK₁ of 8.0) and an α-carboxylic acid group (average pK₂ of 3.1). Histidine also has an ionizable side chain (R group) with a pKa of about 6.0. One of the possible ionization states of histidine is shown in a the image. Select the pH values at which the charged form of the R group would predominate. 6.0 At what pH would the structure shown be the predominant ionization state? Consider the ionization state of all three of the functional groups. 2.2 + The protonated form of the R group of histidine is shown in the structure. The ratio of the charged (protonated) form to the deprotonated form depends on the pK₁ of the R group and the pH of the solution. 4.9 H₂N-CH-C-OH | CH₂ 11.5 + HN -NH29. Amino Acid Chemistry: Using the amino acid chart provided..Ala-Lys-Cys & give the isoelectric point for the tripeptide. Table 23.2 The pK, Values of Amino Acids pk, a-COOH a-NH3* Amino acid side chain Alanine 2.34 9.69 2.17 9.04 12.48 Arginine Asparagine 2.02 8.84 3.86 Aspartic acid Cysteine 2.09 9.82 1.92 10.46 8.35 Glutamic acid 2.19 9.67 4.25 Glutamine 2.17 9.13 Glycine 2.34 9.60 1.82 9.17 6.04 Histidine 2.36 9.68 Isoleucine Leucine 2.36 9.60 2.18 $ 95 10.79 Lysine 2.28 9.21 Methionine 16 9.18 Phenylalanine 1.99 10.60 Proline 2.21 9.15 Serine 2.63 9.10 Threonine 2.38 9.39 Tryptophan Tyrosine 9.11 10.07 2.20 2.32 9.62 Valine O something else! 5.14 O 8.65 something else! 5.81 9.02 9.57The structure of the dipeptide Gly-Asn is given by . The structures of the amino acids Gly and Asn are given below. NH2 H. ČH2 H3N-C-CO H. H3N-C-CO H. Asn Gly NH2 CH2 H H H2 C COO 2. H3N-C -C H. 1. H&N C C-NH C COO NH, NH2 CH2 H. H2 C C NH2 3. H3N-C C- -C COO 4. 0OC-C NH3" Click Save and Submit to save and submit. Click Save All Ansuwers to save all answers. MacBook Air esc 吕0 DII DD F1 F2 F3 F4 F5 F6 F7 F8 F9 @ 2$ & 1 2 4 5 7 8 Q W E R Y | A S D F G K C V N M < CO # 3 HICH