Why do some proteins contain D-amino acids?A. D-amino acids will determine the binding of the protein to itsinteracting partners.B. D-amino acids will determine whether the structure will berecognized and digested by naturally occurring enzymesC. D-amino acids determines the reactions the proteins will undergo.D. D-amino acids determines the solubility of the protein in aqueoussolution.OE. A combination of D and L-amino acids is necessary for the properfolding of protein structures in aqueous solutions.

D amino acids: Amino acids with the orientation of stereogenic alpha carbon to the amino group has…

Answered: Why do some proteins contain D-amino…

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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Denaturation is the loss of protein function from structuralchange or chemical reaction. At what level of proteinstructure or through what chemical reaction does each ofthe following denaturation agents act?a. heatb. strong acidc. saturated salt solutiond. organic solvents (e.g., alcohol or chloroform)
Which of the following is true regarding proteins A. Absorbance of proteins is directly proportional to the molecular weights B.Proteins react with biuret reagent because of their side chains C. two out of the twenty amino acids can absorb at 280nm D. In proteins the average weight per amino acid residue always varies
Which of the following might cause the denaturation of a protein? Select all that apply. A. Highly acidic conditions B. Highly basic conditions C. High concentrations of salt D. High heat
In extracellular proteins the amino acid Cys can interact with another Cys to form a __bond sometimes called ________. The formation of this covalent bond is a reaction. a. O b. disulfide, cystine, oxidizing c. disulfide, cysteine, reducing d. disulfide, cystine, dehydration O e. peptide, polypeptide, oxidizing peptide, polypeptide, condensation
At what level of protein structure does each of the following denaturation act? a. heat b. strong acid c. saturated salt solution d. organic solvents (e.g., alcohol or chloroform)
Which statement(s) correctly describe(s) protein structures?A. All hydrophobic residues are buried when protein structures and protein aggregatesB. Charged and polar amino acid residues are seldom buried in the protein interior C. Lysine is found only in the protein interiorD. Glycine is rarely found in proteins due to its destabilizing effect A,B,C A,C B B,C,D
Below are two amino acids at physiological pH. Number labels are for part c. Answer the following questions about the side chains of these amino acids. H C. H;N* 2 CH2 A H H3N* C 3 CH2 В 4он В a. Which amino acid has a polar side chain? b. Which amino acid is more soluble in water? B c. Select the atom that serves as the hydrogen bond donor in the amino acid's R group.
Which of the following statements are correct about protein folding (select all that appy)? A. Protein folding is a very slow process with most proteins requiring >30 min to go from unfolded to native conformation B. The mature two-chain form of insulin spontaneously folds into the native conformation C. A sharp transition in the presence of denaturants (See Figue 8.1) suggests the protein folds without intermediates D. Proteins randomly sample each possible conformation before arriving final native state E. Proteins with disulfide bridges tend not follow a simple two-state folding mechanism.
A. What type of bond is ( the two mark wtih questions mark) B. What special amino acid side chain is involved in forming these bond C. Does this bond form unde reduction or oxidizing D. Is this bond seen more in cytoplsmic proteins or in extravellular protein
Which of the following is the smallest amino acid?* Please choose one correct answer only. A. G B. A C. P D. W E. D
Which of the following statements about amino acids is true? A. Twenty two amino acids are commonly found in proteins. B. Amino acids are often linked together to form branched polymers. C. All amino acids contain an NH2 and a COOH group. D. Most of the amino acids used in protein biosynthesis have charged side chains.
Which of the following is TRUE, if the protein pH is electrically neutral? Refer to the graph below. a. The denaturation of protein is lower than 100% b. The denaturation of protein is greater than 100% c. The protein is in native form d. The protein is completely denatured

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