Consider each dipeptide. Part: 0/4 Part 1 of 4 ནམ་ཡ་ ཡའི་ཡའི་ ཨག་པ་“་ Identify the amino acid(s) present in this structure. Check all that apply. alanine glycine x methionine glutamine serine phenylalanine cysteine Isoleucine valine leucine threonine asparagine tyrosine None of the above

A peptide has the sequence Glu-His-Trp-Ser-Gly-Leu-Arg-Pro-Gly The pK₁ values for the peptide's side chains, terminal amino groups, and carboxyl groups are provided in the table. Amino acid Amino pKa Carboxyl pKa Side-chain pKa glutamate 9.60 2.34 4.25 histidine 9.17 1.82 6.00 9.39 2.38 9.15 2.21 9.60 2.34 9.60 2.36 9.04 2.17 10.96 1.99 tryptophan serine glycine leucine arginine proline Calculate the net charge of the molecule at pH 3. Calculate the net charge of the molecule at pH 8. 12.48 net charge at pH 3: net charge at pH 8:

Consider each dipeptide. Part: 0 / 4 Part 1 of 4 HO || H H H3N C-C-N-C-COO Identify the amino acid(s) present in this structure. Check all that apply. U U U glycine cysteine valine alanine Ophenylalanine ☐ U U asparagine tyrosine threonine leucine glutamine serine ☐ isoleucine methionine None of the above X

The figure below shows the titration curve for the amino acid aspartic acid. There are five key points in the titration designated with roman numerals. For each of the statements following the figure, identify the appropriate key point of the titration

Consider the peptide Trp-Arg-Glu-Cys-Gly-Tyr. For the drawings requested below,  please show them in zig-zag style, from amino to carboxy terminus, with correct  stereochemistry Draw the predominant form at pH = 2  Draw the predominant form at pH = 5  Draw the predominant form at pH = 7  Draw the predominant form at pH = 12

Provide the number of polypeptide chains present andthe number of amino acid residues in each chain. for https://www.rcsb.org/structure/6j20  Provide the molecular weight of the protein orprotein complex and the total number of atoms. (All of this information can be found in the PDBpage.) Create a figure (available in the PDB page) that shows the topology of your protein, i.e.the secondary structures adopted by different regions of the protein (alpha helix, beta strand).Make sure to also provide a figure legend that helps interpret the figure and appropriate figurecaption that briefly explains the figure.

Assume a protein is composed of 120 amino acid residues and that each amino acid can have three possible orientations. How many total possible orientations are there for the protein? Express the number of possible orientations to three significant figures. ΫΠΙ ΑΣΦ ха хь a b 1.73 106 ● Ĵ √x x X X |X| wwwww Submit Previous Answers Request Answer ? X.10n X orientations The problem is essentially asking about the possible combinations given that you are selecting one of three items a set number of times. It may help to think of a concrete example. If you roll a standard six-sided die, the first roll has six possible combinations. The second roll also has six possible combinations; however, when paired with the first there are 6 x 6 possible sets of numbers. Provided the order of the numbers matters, when rolling a third time there are 6 x 6 × 6 possible sets of numbers. This pattern is 6" where r is the number of rolls. For this problem, there are three possible selections. There are 120…

In the figures are the titration curves of two amino acids. Consider the first titration.

In the molecule of oligomeric protein there are 19 lysine residues. 12 of them may be easily acetylated with anhydrides of dicarbon acids (it react with NH2-groups). The acetylation of extra two residues of lysine will dissociate the protein to the subunits. The rest 5 lysine residues may be modified only after denaturation of the protein. Suggest, how many lysine residues are: a) on a surface of protein globule; b) inside globule: c) in a site which is responsible for the contact within subunits

The bacterially produced antibiotic gramicidin A forms channels in cell membranes that allow the free diff usion of Na+ and K+ ions, thereby killing the cell. This peptide consists of a sequence of Dand L-amino acids. The sequence of a segment of fi ve amino acids in gramicidin A is R-Gly-L-Ala-D-Leu-L-Ala-D-Val-R′. Complete the Fischer projection below by adding the correct group to each vertical bond.