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Concept explainers
Interpretation:
Number of ways four different amino acids can be arranged in a peptide is to be identified.
Concept Introduction:
Many amino acids are linked together through amide bonds to form a biologically large molecule known to be proteins.
Amino
In protein the amide bond can link together with two amino acids to form a peptide bond.
Primary structure of protein is a sequence in which the amino acids linked by peptide bond in a protein.
The number of arrangement for each set of amino acid can be calculated from
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Chapter 18 Solutions
Fundamentals of General, Organic, and Biological Chemistry, Books a la Carte Plus Mastering Chemistry with Pearson eText -- Access Card Package (8th Edition)
- Why is it no longer considered necessary to determine theN-terminal amino acid of a protein as a separate step?arrow_forwardWhat are intrinsically disordered proteins ? What are their features in terms of amino acid composition ? How do the unstructured domains in these proteins relate to their function ?arrow_forwardWrite the entire primary structure of the peptide. (Remember you may use the three letter abbreviation or the single letter abbreviation. To get a mark, use the three letter abbreviation in this question item. Use dashes (-) to separate each amino acid and no spaces in the answers). Met-?-?-........ (This is the primary structure of proteins; which is in fact, the amino acid sequences in the polypeptide chain.) Write as amino acid 1-amino acid 2- and so on; use the three letter abbreviations and separate them with dashes and no spaces). Again, the DNA segment containing the gene sequence encoding for the peptide is as follows: (this is a continuous sequence of only 1 DNA strand) GT CCCGGAT GCCAAGCGTAGGCCGTTGC GGCATGGCCTAAGA TTCGCATCCTGAAACGCCarrow_forward
- Consider the peptides Pro-Gin-Val-Phe-His-Asp-Cys and His-Gln-Pro-Cys-Asp-Phe-Val. How do these two peptides differ? (Select all that apply.) The two peptides have different compositions. The two peptides have different isoelectric points. The two peptides have different titration curves. The two peptides differ in amino acid sequence. [References] If you were to have a mythical amino acid based on glutamic acid, but one in which the hydrogen that is attached to the y-carbon were replaced by another amino group, what would be the predominant form of this amino acid at pH 12 if the pK, value were 10 for the unique amino group? (Select all that apply.) Both of the carboxyl groups are deprotonated. The amino acid-carries a negative 2 charge. The amino acid carries a negative 4 charge. The amino groups are in the form -NH". Both of the amino groups are deprotonated.arrow_forwardConsider the following peptide to answer the questions below: A M A K K E S H I F T A I D E What is the total charge of this peptide at pH = 5? What is the N terminal amino acid (full name)? C terminal amino acid? How many fragments would result if this peptide underwent proteolytic cleavage with V-8 protease and what are these fragments (list them)? Would this peptide be a candidate to form an alpha helix? Why or why notarrow_forwardHow do D-amino acids differ from L-amino acids and what are the biological roles that are played by peptides that have the D-amino acids?arrow_forward
- (a) Draw the structure of the two possible dipeptides that can be formed by combining glycine and asparagine. (b) In each dipeptide, label the N- and C-terminal amino acids. (c) Name each peptide using three-letter symbols.arrow_forwardConsider the following peptide: Lys-Tyr-Glu-His-Arg-Ala-Asp-Arg-Glu-Tyr-Lys a) What is the net charge of this peptide at pH=1? Show your work. b) What is the net charge of this peptide at pH=14? Show your work.arrow_forwardThe R group or side chain of the amino acid serine is -CH2-OH. The R group or side chain of the amino acid leucine is -CH2-CH-(CH3)2. Where would you expect to find these amino acids in a globular protein in aqueous solution ?A) Both serine and leucine would be on the exterior of the globular protein. B) Both serine and leucine would be in the interior and on the exterior of the globular protein. C) Serine would be in the interior, and leucine would be on the exterior of the globular protein. D) Both serine and leucine would be in the interior of the globular protein. E) Leucine would be in the interior, and serine would be on the exterior of the globular protein.arrow_forward
- For the amino acids listed below, what tertiary/quaternary interaction can each of the amino acids participate in? 1)Alanine 2)Asparagine 3) Aspartic Acid 4) Argininearrow_forwardWhat would be the molecular sequence of the amino acid chain asp-leu-leu? (i.e. draw the whole sequence out as molecules joined together)arrow_forwardWhat distinguishes d-amino acids from lamino acids? What biological functions do peptides containing d-amino acids serve?arrow_forward
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