Homework Answers
1=False
At physiological pH all amino acid exist in zwitter ionic form.(dipolar electrically neutral)
4=True
Alpha helix is secondary structure of protein
5=False
Triple helix of collagen is secondary structure.
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true or false. at physiological PH, nearly all amino acids
have overall positive charge
True False...
CASE 6. A Collection of Collagen Cases Case 2 A group of investigators synthesized a series...
CASE 6. A Collection of Collagen Cases Case 2 A group of investigators synthesized a series of collagen-like peptides each containing 30 amino acid residues in order to study the important interactions among the three chains in the triple helix. The following peptides were synthesized: (1) (Pro-Hyp-Gly)., (2) (Pro-Hyp-Gly).-Glu-Lys-Gly-(Pro-Hyp- Gly), and (3) Gly-Lys-Hyp-Gly-Glu-Hyp-Gly-Pro-Lys-Gly-Asp-Ala-(Gly-Ala-Hyp),-(Gly-Pro-Hyp),GV. These peptides are abbreviated (1) (POG)... (2) EK-containing peptide and (3) T3-487 in the table below. (Note that "0" is the one-letter abbreviation for hydroxyproline.) Table 6-2:Stability...
Since the secondary structure of a protein results from hydrogen bonding between components shared by all amino acids
Distinguish between the different levels of protein structure, including primary, secondary, tertiary, and quaternary Question Is the following statement true? If not, explain why not: Since the secondary structure of a protein results from hydrogen bonding between components shared by all amino acids (a hydrogen on an amide N on one amino acid interacts with an oxygen on the carbonyl of another amino acid), the secondary structure does not depend on the specific amino acid groups (the R-groups) in the amino acid chain. Select...
19) The form of dipeptide aspatylserine (Asp-Ser) obtained from two amino acids, aspartic acid an...
19) The form of dipeptide aspatylserine (Asp-Ser) obtained from two amino acids, aspartic acid and serine, whose structures are shown here, is HiN-CH-C-0HIN-CH-C-0 CH2 CH OH aspartic acid serine A HN-CH-C-o-N-CH-C-o CH OH CH2 coo -(H-C-o-H-c-o CH OH CH2 HIN CH-C-N-CH-C-O CH OH CH H-CH-CH CH CH OH coo- 20) Where is the peptide bond located in this dipeptide? serine valine a) the CO-NH joining serine and the valine b) the doubly bonded oxygen just left of center between the...
need help Question 25 (1 point) Al physiological pH, all of the standard amino acids: Will...
need help
Question 25 (1 point) Al physiological pH, all of the standard amino acids: Will be good buffers O will only exist as L-enantiomers Will be at their p! Will contain at least one positive and at least one one negative charge
Consider the following amino acids for questions 11-13. Choose the best answers. cysteine serine lysine phenylalanine...
Consider the following amino acids for questions 11-13. Choose the best answers. cysteine serine lysine phenylalanine aspartate Which amino acid's R group has a pKa nearest physiological pH? Which amino acid would you most expect to find in the centre of a folded globular protein? Which amino amino acid can be phosphorylated? The overall charge on the peptide (G-R-A-M-P-S) at pH 12.5 is: -1 -0.5 -1.5 +0.5 1 15. What term best describes the protein secondary structure element drawn below:...
I have two questions: 1) TRUE or FALSE? Explain your answer The isoelectric point (pI) of...
I have two questions:
1) TRUE or FALSE? Explain your answer
The isoelectric point (pI) of the tripeptide Lys-Lys-Lys
(structure with no indication of ionization state shown below) will
correspond to the pH at which each of the epsilon-amino groups is
appoximately one-third protonated
https://www.sigmaaldrich.com/content/dam/sigma-aldrich/structure7/142/mfcd00038220.png/_jcr_content/renditions/mfcd00038220-medium.png
2) What would you predict about the likely ratio of hydrophilic
to hydrophobic residues in a series of globular monomeric proteins
that range in size from 10,000 to 100,000 Da? How might the ratio
of...
What kinds of interactions are NOT part of tertiary protein structure? 3 . A) salt bridges...
What kinds of interactions are NOT part of tertiary protein structure? 3 . A) salt bridges In a hydrolysis reaction, B) hydrophilic interactions A. an acid reacts with an alcohol. C) disulfide bonds E. an este reacts with NaOH. C. anester reacts with H.O. D) peptide bonds D. an acid neutralizes a base. E) hydrophobic interactions E. water is added to markene. . All amino acids have chiral Carbon atoms except a. Val 6. Lys C. ASP d. Ala e....
(18 pts) Answer True or False for each of the following questions (a) An amino acid...
(18 pts) Answer True or False for each of the following questions (a) An amino acid is in the zwitterionic form only if the pll is well below 7 (b) Salting out takes advantage of the fact that the solubility of proteins varies with concentration. (c) Proteins usually consists of amino acids of both L-isomers (d) Essentially all a-helices found in proteins are left-handed globular protein is thermodynamically the most stable structure. ( Isoclectric focusing can be used to separate...
of alanine has a pk of 9.87. What is the 153, The amino group charge on...
of alanine has a pk of 9.87. What is the 153, The amino group charge on that amino group at pH 7.0 145. Which amino acid serves as the first amino acid at the hN terminus of a newly synthesized protein? (B) methionine (A) alanine 9.80. The side chain of that amino acid includes (A) an amine group (C) a carboxylic acid group. (D) an alcohol 154. A certain amino acid has a pl (or pH, isoelectric point) (D) threonine...
Cyw Ala Ατα Ile Ausn Lou Asp aly Lys Ser Which molecule below is asubunit of...
Cyw Ala Ατα Ile Ausn Lou Asp aly Lys Ser Which molecule below is asubunit of peptide chains a. Acetic acid b. Alanine O. ATP d. Gracil Report the charge on most aqueous aspartie acid molecules at pH-7. Report the approximate p values for the amino acid whose titration curve is shown below (note there may be more slots for answer than answers). A) Value 1 B) Value 2 c) Value 3 c) Value 4 The structure of a rare...
CASE 6. A Collection of Collagen Cases Case 2 A group of investigators synthesized a series of collagen-like peptides each containing 30 amino acid residues in order to study the important interactions among the three chains in the triple helix. The following peptides were synthesized: (1) (Pro-Hyp-Gly)., (2) (Pro-Hyp-Gly).-Glu-Lys-Gly-(Pro-Hyp- Gly), and (3) Gly-Lys-Hyp-Gly-Glu-Hyp-Gly-Pro-Lys-Gly-Asp-Ala-(Gly-Ala-Hyp),-(Gly-Pro-Hyp),GV. These peptides are abbreviated (1) (POG)... (2) EK-containing peptide and (3) T3-487 in the table below. (Note that "0" is the one-letter abbreviation for hydroxyproline.) Table 6-2:Stability...
19) The form of dipeptide aspatylserine (Asp-Ser) obtained from two amino acids, aspartic acid and serine, whose structures are shown here, is HiN-CH-C-0HIN-CH-C-0 CH2 CH OH aspartic acid serine A HN-CH-C-o-N-CH-C-o CH OH CH2 coo -(H-C-o-H-c-o CH OH CH2 HIN CH-C-N-CH-C-O CH OH CH H-CH-CH CH CH OH coo- 20) Where is the peptide bond located in this dipeptide? serine valine a) the CO-NH joining serine and the valine b) the doubly bonded oxygen just left of center between the...
need help
Question 25 (1 point) Al physiological pH, all of the standard amino acids: Will be good buffers O will only exist as L-enantiomers Will be at their p! Will contain at least one positive and at least one one negative charge
Consider the following amino acids for questions 11-13. Choose the best answers. cysteine serine lysine phenylalanine aspartate Which amino acid's R group has a pKa nearest physiological pH? Which amino acid would you most expect to find in the centre of a folded globular protein? Which amino amino acid can be phosphorylated? The overall charge on the peptide (G-R-A-M-P-S) at pH 12.5 is: -1 -0.5 -1.5 +0.5 1 15. What term best describes the protein secondary structure element drawn below:...
What kinds of interactions are NOT part of tertiary protein structure? 3 . A) salt bridges In a hydrolysis reaction, B) hydrophilic interactions A. an acid reacts with an alcohol. C) disulfide bonds E. an este reacts with NaOH. C. anester reacts with H.O. D) peptide bonds D. an acid neutralizes a base. E) hydrophobic interactions E. water is added to markene. . All amino acids have chiral Carbon atoms except a. Val 6. Lys C. ASP d. Ala e....
(18 pts) Answer True or False for each of the following questions (a) An amino acid is in the zwitterionic form only if the pll is well below 7 (b) Salting out takes advantage of the fact that the solubility of proteins varies with concentration. (c) Proteins usually consists of amino acids of both L-isomers (d) Essentially all a-helices found in proteins are left-handed globular protein is thermodynamically the most stable structure. ( Isoclectric focusing can be used to separate...
of alanine has a pk of 9.87. What is the 153, The amino group charge on that amino group at pH 7.0 145. Which amino acid serves as the first amino acid at the hN terminus of a newly synthesized protein? (B) methionine (A) alanine 9.80. The side chain of that amino acid includes (A) an amine group (C) a carboxylic acid group. (D) an alcohol 154. A certain amino acid has a pl (or pH, isoelectric point) (D) threonine...
Cyw Ala Ατα Ile Ausn Lou Asp aly Lys Ser Which molecule below is asubunit of peptide chains a. Acetic acid b. Alanine O. ATP d. Gracil Report the charge on most aqueous aspartie acid molecules at pH-7. Report the approximate p values for the amino acid whose titration curve is shown below (note there may be more slots for answer than answers). A) Value 1 B) Value 2 c) Value 3 c) Value 4 The structure of a rare...
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