### Structure of Phenylalanine and Biuret Test Analysis**3. The structure of phenylalanine is shown to the right.****Chemical Structure Breakdown:**- The structure consists of an amino group (\(\text{H}_3\text{N}^+\)) attached to a central carbon (alpha carbon).- The central carbon is also bonded to a hydrogen atom, a carboxylate group (\(\text{COO}^-\)), and a phenyl group (benzene ring).**(a) Will phenylalanine test positive or negative in the biuret test? Why?**- **Answer:** The biuret test is used to identify peptide bonds, which are present in proteins. Phenylalanine is an amino acid and does not contain peptide bonds within its structure. Therefore, phenylalanine will test negative in the biuret test.**(b) What color do you expect when phenylalanine is added to the biuret test?**- **Answer:** Since phenylalanine will test negative, there will be no color change expected in the biuret test. The biuret test typically turns violet in the presence of proteins or peptides, but in this case, the solution would remain the color of the reagent (typically blue).

Biuret test can be used to detect presence of proteins and peptides. Cupric ions present in copper…

Answered: (a) Will phenylalanine test positive or…

Biology (MindTap Course List)

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Chapter3: The Chemistry Of Life: Organic Compounds

Section3.1: Carbon Atoms And Organic Molecules

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E. PROTEIN PRIMARY STRUCTURE ELUCIDATION. 1. Determine the primary structure of the protein described below. Write the final sequence using the corresponding three-letter code for each amino acid. Example: M-F-Y-R should be written as Met-Phe-Tyr-Arg Treatment with cyanogen bromide and sequencing yields the following peptide fragments: o D-M o R-A-Y-G-N o L-F-M Chymotrypsin digestion and sequencing yields the following peptide fragments: o G-N D-M-L-F o M-R-A-Y o o
8:14 Worksheet 2 Carboh... I. Draw the structures for the Haworth projection for the given molecules below. Identify the L- configuration and do the same for each structure. (0.5 point each structure). Monosaccharide CHO H- OH H OH H- OH HOH CH₂OH CH₂OH C=O H -OH H -OH H- OH II. CH₂OH Maltose Lactose Haworth Projection a-D-Monosaccharide B-D-Monosaccharide L-configuration Complete the table below. (0.5 point each item). Disaccharide Sucrose Cellobiose Haworth Projection a-L-Monosaccharide B-L-Monosaccharide Draw the monomeric unit/s in Haworth Projection Linkage This worksheet for MTY1107 and BIO1105 was created by Lawrence Adrian B. Tacliad, RCh, Vladimir U. William, MSc, RC, and Eryka Marie P. Pangan, RChT, and is the sole property of the Department of Mathematics of Far Eastern University. No part of this worksheet shall be reproduced without written permission from the owner. 1 MTY1107/BIO1105 LECTURE WORKSHEET 2 Carbohydrates: Structure and Function III. Complete the table below.…
Column A shows the names of some of the important functional groups. Column B shows their structures. Match each entry in column A with one in column B
ok-Personal Microsoft Edge com/maildeeplink 021 pdt Download Print Save to OneDrive 1. Draw the structure of the pentapeptide Gln-Trp-His-Glu-Tyr that would predominate in aqueous solution at pH3D10.3. (Relevant pka values are: 2.2 4.3, 6.0, 9.8, and 10.1) Acp is adiusted to
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2. . questions below. Assume the following pKa values: N-terminal –NH3®, 7.0; all -COOH groups, 4.0; Arg, 12.5; Cys, 8.4; His, 6.0; Lys, 10.0; Tyr, 10.0. Calculate the overall charge (pH 7) on the following three polypeptides and answer the (A) Ser-Tyr-Ser-Met-Glu–His–Phe–Arg-Trp-Gly-Lys-Pro–Val-Gly-Lys-Lys-Arg-Arg-Pro-Val-Lys–Val-Tyr-Pro-Asp-Ala -Gly- Glu--Asp-Gln- Ser-Ala-Glu-Ala-Phe-Pro-Leu-Arg-Glu-Phe (B) Ser-Tyr-Ser-Met-Glu–His–Phe-Arg-Trp-Gly-Ala-Pro-Val-Gly-Glu-Glu-Cys-Asp-Pro-Val-Glu–Val-Tyr-Pro-Asp- Ala-Gly-Glu-Asp-Gln-Ser-Ala-Glu-Ala-Phe-Pro-Leu-Glu–Phe-Cys-Ser-Tyr-Ser-Met–Glu–His-Phe-Asp-Trp-Gly- Asp-Pro-Val-Gly-Pro-Asp-Ala-Gly-Asp-Gln-Pro-Val-Gly-Glu-Glu-Cys-Asp-Pro-Val-Glu-Val-Tyr-Pro-Asp-Ala (C) Gly-Ser-Val-Arg-Asp-Pro-Val-Lys-Glu-Val-Tyr-Pro-Asp- Lys-Ala-Gly-Arg-Glu-Ser-Arg-Ala (g) Which of the three peptides would migrate the furthest away from the anode in isoelectric fo- cusing (h) Which of the peptides would migrate the closest to the cathode in isoelectric focusing?…
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01 Description Please draw the structure of the 19 L-a-amino acids and proline in any form, as you prefer. You may want to use a letter-size sheet or larger, it's up to you. Guiding principle: You want to understand the differences among amino acids. Although you may want to only draw the R-group it's preferable to draw it along with the rest of the molecule (i.e., the Ca, the amino group and the carboxyl group). Here are some examples (your drawings should not limited to the following styles): NH₂ OH Alanine H H O OH Proline lysine alarmy stock płwłos Tryptophan OH COOH | H₂N-C-H CH₂ Phenylalanine arginine

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(a) Will phenylalanine test positive or negative in the biuret test? Why? (b) What color do you expect when phenylalanine is added to the biuret test?