What is the difference between a peptide and a protein? 2. What type of bond is the peptide bond? Explain why the peptide bond is rigid. 3. The pentapeptide Gln-Tyr-Asn-Ala-Asp is present in human cerebrospinal fluid, and its concentration increases in demyelinating diseases. In these diseases, the myelin sheath of nerves is damaged and impairs the conduction of nerve signals. a. What is the N-terminal amino acid? b. What is the C-terminal amino acid? c. How many peptide bonds does this pentapeptide contain? From how many amino acids is this pentapeptide derived? d. Write the structure, the three-letter designation and the IUPAC name of this pentapeptide.

Q: Draw the ff. peptides: DK YES CHEM What is the pI of each peptide? Predict the ionic form of the…

A: Peptides are small polymer of amino acids which is linked by peptide/amide (covalent bond). Alpha…

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Q: 4. Draw the example of Ramachandran plot for: A) regular secondary structure (4=60-65; y-60-80) B)…

A: Ramachandran plots depict the combination of backbone dihedral angles and statistical distribution.…

Q: 5. The tertiary structure of a protein involves attractions and repulsions between the side chain…

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Q: 1. a. What is the role of these bond of the polypeptide in determining the secondary structure of…

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Q: 2. PICK ONE: Decide whether you will use peptide YAD or peptide SHY а. What are the amino acids (in…

A: Let's choose peptide YAD. pKa of carboxyl group (aspartic acid) = 1.88 pKa of side chain group…

Q: 4. Draw the bond-line structure of the peptide that corresponds with the following sequence of amino…

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Q: Amino acid Ala Asp Arg Cys a-carboxyl group a-amino group pK a pK a 2.35 9.78 1.99 9.90 1.82 8.99…

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Q: Suppose you have a peptide composed of 4 amino acids bonded together: alanine, arginine, asparagine,…

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Q: 1. A simplified structure of the peptide Lys-Glu-Ser with just the ionizable groups in the charged…

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Q: 4. Write the structure of each of the following peptides at pH 7: a. Alanylphenylalanine b.…

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Q: I. True or False   a. The beta-pleated sheets are formed by H-bonds among adjacent regions of the…

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Q: Case B: An oligopeptide has the ff amino acid composition: 2 Phe, 2 Met, 2 Glu, 1 Arg, 1 Val, 1 Leu,…

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Q: Lysine is similar to ornithine. .Why does lysine not form a lactam? a. Infrequency of lysine…

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Q: 9. Use pKa values from the table to calculate isoelectric points for these three amino acids. CH3 NH…

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Q: 2. Calculate the pI of the following primary structure of protein A) Lys- Gly- Ala- Gly B) Lys-…

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Q: Consider the peptide with amino acid sequence NICE. a. Write the full name and the three-letter…

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Q: 7. A peptide has the sequence Cys-His-Glu-Met-lle-Ser-Thr a. Write out the single letter sequence of…

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Q: The graph to the right displays the degree of helicity that was measured for a peptide as nine…

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A: Protein structure:  Primary  Secondary Tertiary  Quaternary

Q: 1. Which one of the following statements concerning the peptide shown below is correct?…

A:

Q: 3) The following is the amino acid sequence of bradykinin, a peptide released by certain organisms…

A: P

Q: 2. A group of peptides that influence nerve transmission in certain parts of the brain have been…

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Q: In x-ray studies of crystalline peptides, Linus Pauling and Robert Corey found that the C—N bond in…

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Q: In relation to the peptide sequence that is presented. -Gly - Ser – Cys – Asp – Glu – Arg – Cys –…

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Q: Given amino acids A and B 5. Draw the structure of amino acid A at pH < pI 6. Draw the structure…

A:

Q: 1. Shown below is the chemical structure for a 5-amino acid pentapeptide. Use this diagram to answer…

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Q: Which peptide would be more soluble at pH 7.0, (Val)₂₀ or (Asp)₂₀ ? at pH 3.0, (Gly-Glu-Val)

A: Proteins have their least solubility close to the pH that is equal to their pI.

Q: 4. Below is a polypeptide with an unknown number of amino acids. On the diagram below: a. Circle…

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Q: 4. Amino acids are linked together by peptide bonds to form polypeptides. (a) Draw the structure of…

A: Polypeptides are considered as the long chain of amino acids, which are joined by peptide bonds.

Q: 2. A functional protein that is approximately 110 kDa in size has all its cysteine residues joined…

A:

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Q: Рeptide

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Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.