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

At what pH can you separate the following peptides: ala-ala-ala, glu-glu-glu, his-his-his? OA 2.0 B. 4.0 C. 5.0 O D. 7.0 E. 9.5

A new amino acid is found with the alpha N and backbone COOH pKa's the same as histidine but with a neutral side chain. What is the isoelectric point of this new amino acid?

Match amino Acid R group characteristics to the biochemical bond it can form. Alanine ◆ Glycine Proline Aspartic Acid Lysine Tryptophan ◆ Methionine Threonine Asparagine Histidine A. Pi-bonding aromatic bonds B. Non-polar, contains a sulfur atom C. Non polar bonds D. Amide group bonds E. Inserts a kink (non-freely rotating bond F. Anionic group donating bonds G. Hydroxy group bonding H. Cationic group with pK = 6.0 I. No-R group - highly flexible J. Cationic group donating bond

Create an oligopeptide via dehydration synthesis using the following amino acids. O. H Tryptophan (TRP) C-C-N но сн, C-C-N. но Glycine (GLY) H H HN

A dipeptide is built from many amino acids: A. True B. False

Which of the following is incorrect about the peptide Arg-Asp-Cys-Tyr-Gln-Arg-Glu? It has six peptide bonds b. It has a net charge of zero at pH 7 It has six charged groups at pH 7 d. None; all the other choices are correct a. C.

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Which of the following describes the most likely outcome of a mutation that causes a sin- gle amino acid to be removed from a protein subunit? A It will affect the primary, secondary, and tertiary structures of the protein. B с D It will affect the secondary and tertiary structures of the protein but not the primary structure. There will be no observable effect on the structure of the protein. It will change the primary structure of the protein without affecting other structures in the protein.

Which of the following statements are TRUE? Multiple answers:Multiple answers are accepted for this question PLEASE SHOW WORK FOR EACH PART AND EXPLAIN WHY EACH ANSWER CHOICE IS WRONG OR RIGHT a. The tripeptide His-Lys-Glu has a net charge of -2 at pH 8.0. b. The tripeptide Asp-Asp-Asp has a net charge of -3 at pH 7.0. c. The tetrapeptide His-His-His-His has a net charge of -1 at pH 7.0. d. There are 6 possible sequences for a tripeptide containing Arg - His - and Pro. e. Certain bacteria synthesize cyclic tetrapeptides. The net charge at pH 7.0 of a cyclic tetrapeptide consisting of two Pro and two Tyr is 0.