The naturally occurring opioid met-enkephalin is a peptide with the structure Tyr-Gly-Gly-Phe-Met. What is its net charge of this molecule in the body at pH 7.A) +1B) +2C) OD) -1E) -2

Amino acids are zwitterions having both positive and negative charges at neutral pH. The net charge…

Answered: The naturally occurring opioid…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Define the following terms: a. lactone b. aldaric acid c. aldonic acid d. uronic acid e. epimerization
Draw the formula of each of the following: a. Aspartic acid-histidine-tryptophan b. Glycine-cysteine-tyrosine with the charges that exist in cell fluid.
For each of the following chemicals, name the general class they belong to, discuss their solubility in water and explain why they are/are not soluble in water: a) CH3(CH2)26COOH b) KCl c) CH3
Given the figure below. Which structure is predominant at pH = 8.0? (Note: The amino acid structures on the topmost portion are labeled as A, B, C and D from left to right) * çOOH pK1 H3Nt CH CH2 CH2 CH2 ČH2 NH3* poo H2N-CH CH2 CH2 GH2 CH2 NH2 foo H2N-CH CH2 çoo pK2 pk3 CH2 CH2 NH3* NH3* 14 1 pK2 pl pk3 12 10 pH 6 4 pK1 2 0.5 1 1.5 2 2.5 3 Equivalents of OH
c) Jean-François is studying a specific protein in a research laboratory. In previous experiments, he observed that this protein seems to function as a receptor protein on the surface of cells that recognizes a specific hormone involved in cell-cell communication. Jean-François prepares his final experiment, but makes a mistake in calculating how much HCl to add to one of his solutions to get the correct pH. He performs the experiment, and much to his surprise, he observes that his protein no longer seems to be recognizing the hormone anymore as he had observed in previous experiments. Propose a hypothesis that briefly explains (2-3 sentences) why the results of Jean-François’ experiment have changed. oportmost likely h beens dy the celyd must irst ir o nm cof the st omce MAnoncalest wanti patient Hewe umourcells Becnuse of falla anan intoindidual.cells. protein d) True or false: A mutation could cause the same change in Jean-François' experimental results as the change in pH described…
There is parts A-D for the picture provided. A) A peptide has the sequence, Arg-Cys-His-Tyr-Glu-Asn-Lys-Asp. What is the net charge at pH 1? Choices: -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 B) A peptide has the sequence Arg-Cys-His-Tyr-Glu-Asn-Lys-Asp. What is the net charge at pH 5? Choices: -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 C) Same Peptide sequence, What is the net charge at pH8.5, (N-terminus is pronated) Choices: -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 D) A peptide has the sequence, Arg-Cys-His-Tyr-Glu-Asn-Lys-Asp. What is the net charge at pH 13? Choices: -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 Thank You!
Which of the following is true A) The disulfide bridges formed by reduction of the sulfhydryl groups on cysteine destabilizes protein tertiary structure. B) The disulfide bridges formed by oxidation of the sulfhydryl groups on cysteine destabilizes protein tertiary structure. C) The disulfide bridges formed by oxidation of the sulfhydryl groups on cysteine stabilizes protein tertiary structure. D) The disulfide bridges formed by reduction of the sulfhydryl groups on cysteine stabilizes protein tertiary structure.
Select the term in column B which best matches the description in column A. There are more terms then needed. Column A Column B 1. The pentose sugar found in DNA. a) Cis fatty acid b) Trans fatty acid c) Coenzyme d) Cofacipr 2. Commonly referred to as "insoluble fiber". 3. Considered to be an amphipathic molecule. 4. A molecule with the formula C18H3602 is probably a e) Phospholipid 5. Bond created during the formation of the primary structure of a protein. ) Glycogen 6. A non-protein organic molecule needed for proper enzyme functioning. g) Cellulose 7. Pyrimidine base found only in RNA. h) Galactose i) Fructose 8. Increasing the number of these molecules in the cell membrane would increase the permeability of the cell membrane. i) Thymine k) Uracil 9. Bond which connects nucleotide monomers together. 1) Fatty acid m) Disaccharide n) Peptide bond o) A-Helix p) B-Pleated Sheet q) Ribose r) Deoxyribose 10.
"Potassium Bromate (KBr03) is added to flour as a softener that strengthens the texture of bread. It can do this by forming disulfide bonds between two cysteine amino acids in a reaction similar to the chemical equation given below. The function of KBr03 is to remove the 2 electrons needed to form the disulfide bond as shown in the figure below. Each of the cysteine amino acids will be in a protein chain, so the reaction binds the two chains together, giving the dough cohesion. However, potassium bromate is a proven carcinogen and is only allowed in foods in the United States because bakers will add the right amount and correct It has been assumed to meet the temperature and cooking time conditions. " KBRO, + C,H¸NO,SH → KBr + H,O+C,H„N,O,S, Balance the reaction of potassium bromate (KBr03) with the cysteine molecule (C3H6 NO2 SH) by converting it into the reduced step matrix using the additive matrix method. (Kis the symbol of potassium in the question) (Homogeneous linear equation…
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
b) The likelihood of both triglycerides and phospholipids to behave as liquids at a given temperature is affected by their degree of saturation. Explain what saturation is and provide a biochemical explanation for why it affects the likelihood of a lipid to behave as a liquid at a given temperature. 5) a) Proteins have multiple "levels" of structural complexity. Match the type of chemical bond on the left with the level of protein structure that they are specifically involved in maintaining on the right. (Note that more than one letter may apply to each structural level and that each letter may be used more than once or not at all). a. disulphide bonds Tertiary structure b. hydrogen bonds Primary structure c. ionic bonds Quaternary structure d. peptide bonds Secondary structure

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The naturally occurring opioid met-enkephalin is a peptide with the structure Tyr- Gly-Gly-Phe-Met. What is its net charge of this molecule in the body at pH 7. OA) +1 B) +2 Oco D) -1 OE) -2