Which of the pairs of amino acids can form a salt bridge at physiological pH? lysine...
Which of the pairs of amino acids can form a salt bridge at physiological pH?
lysine and glutamic acid
two cysteines
arginine and tyrosine
glutamic acid and aspartic acid
aspartic acid and histidine
Homework Answers
Correct answer is A) Lysine and Glutamic acid
Reason: Lysine is a basic amino acid. Its side chain amino group is protonated at physiological pH resulting in positive charge.
Glutamic acid is an acidic amino acid. Its side chain carboxyl is deprotonated at physiological pH resulting in negative charge.
Hence, these two will form salt bridges.
Incorrect choices:
Two cysteines : These two form a disulfide bond rather than a salt bridge.
Arginine and Tyrosine: Arginine bears positive charge at physiological pH but Tyrosine has unionized side chain.
Glutamic acid and aspartic acid : Both these are negatively charged at physiological pH and hence cannot form salt bridge with each other.
Aspartic acid and histidine : Aspartic acid is negatively charged while histidine is uncharged at physiological pH. Hence, it does not forms salt bridges.
Add Answer to:
Which of the pairs of amino acids can form a salt bridge at
physiological pH?
lysine...
Consider a protein with the acidic side chains, Amino Acid side-chain Arginine pKa = 12.48 Aspartic...
Consider a protein with the acidic side chains, Amino Acid side-chain Arginine pKa = 12.48 Aspartic Acid PKa = 3.90 Cysteine pKa = 8.33 Glutamic acid pKa = 4.07 Histidine pKa = 6.04 Lysine pKa =10.79 Tyrosine pKa =10.13 Given that the pH of blood is about 7.3, how many of the above side chains would be mostly in their ionic form (A-) in blood? 2 3 4 5
Identify the kind of chemical catalysis and then identify which of the given amino acids can...
Identify the kind of chemical catalysis and then identify which of the given amino acids can act as a catalyst for the reaction. HN-C-Coo H ¢-Coo HN— _—-coo MN -COOHN- -c coo histidine glutamic acid serine methionine lysine O că-oá D D HOH glutamic acid serine lysine histidine methionine caro Сх OH , Which amino acid would catalyze the reaction? The reaction is an example of acid-base catalysis covalent catalysis O glutamic acid O serine lysine histidine O methionine metal...
The one-letter sequence is: WATER a) Draw the peptide (R-groups trans), indicating charges, in pr...
The one-letter sequence is: WATER
a) Draw the peptide (R-groups trans), indicating charges, in
predominant form found at pH = 0.
b) What is the isoelectric point?
c) What is the average charge on the population of peptide
macromolecules at pH = 2.2?
d) What is the average charge on the population of peptide
macromolecules at pH = 12.5?
TABLE 4.1 Amino Acid Alanine Arginine Asparagine Aspartic acid Cysteine....« Glutamic acid Glutamine Glycine Histidine Isoleucine Leucine Lysine … Methionine Phenylalanine...
Which sequence of amino acids, if any, would you predict to find in the interior of...
Which sequence of amino acids, if any, would you predict to find in the interior of chymotrypsin (not the active site)? A. threonine, arginine, tyrosine B. glutamic acid, isoleucine, lysine C. valine, tryptophan, glycine D. None of the above. The answer is C, please explain why? Is it because those are hydrophobic amino acids?
question 1. Tell me the likely charges on the following amino acids at the indicated pH....
question 1. Tell me the likely charges on the following amino acids at the indicated pH. (please describe the steps) thanks. Aspartic acid (pK 4.7) at a pH of 9 Glutamic acid (pK 4.7) at a pH of 2 Lysine (pK of 10.2) at a pH of 7 Lysine (pK of 10.2) at a pH of 10.2
13. For each of the following standard amino acids, provide the one-letter symbol and indicate whether...
13. For each of the following standard amino acids, provide the one-letter symbol and indicate whether the amino acid belongs to acidic, basic, polar or non-polar group? Histidine Arginine Lysine Threonine Methionine Glutamic acid Tryptophan
6. (1 pt each) What type of interaction (hydrophobic, hydrophilic, salt bridge, disulfide) would you expect...
6. (1 pt each) What type of interaction (hydrophobic, hydrophilic, salt bridge, disulfide) would you expect between the R groups of the following amino acids in the tertiary structure of a protein? a) cysteine and cysteine disultide b) aspartic acid and lysine c) tyrosine and water
Consider the amino acid lysine: a. At physiological pH (pH = 7.4), what is the predominant...
Consider the amino acid lysine: a. At physiological pH (pH = 7.4), what is the predominant form in solution? b. What percent of the side chain group is ionized at this pH? c. What percent of the carboxylic acid group is ionized at this pH?
The chemical structures of the 20 standard amino acids at pH 7, along with their 3...
The chemical structures of the 20 standard amino acids at pH 7, along with their 3 and 1 letter codes, are givern in alphabetical order below. While the oxygen and nitrogen atoms of the peptide bonds may serve as a donor atom to complex a metal ion, very often the ligands for the metal come from the amino acid side chains. Takea few moments to examine the chemical structures of the different side chains. Circle the side chains that you...
What amino acid is attached to a tRNA with the following anticodon: 5' GCA 3'? SECOND...
What amino acid is attached to a tRNA with the following anticodon: 5' GCA 3'? SECOND POSITION с A U phenyl- alanine tyrosine cysteine U serine U с A leucine stop stop tryptophan stop G histidine U с A с leucine proline arginine FIRST POSITION glutamine THIRD POSITION G U isoleucine asparagine serine A threonine A lysine arginine methionine G U с A valine G aspartic acid glutamic acid alanine glycine and start Cysteine Alanine Arginine Serine
Identify the kind of chemical catalysis and then identify which of the given amino acids can act as a catalyst for the reaction. HN-C-Coo H ¢-Coo HN— _—-coo MN -COOHN- -c coo histidine glutamic acid serine methionine lysine O că-oá D D HOH glutamic acid serine lysine histidine methionine caro Сх OH , Which amino acid would catalyze the reaction? The reaction is an example of acid-base catalysis covalent catalysis O glutamic acid O serine lysine histidine O methionine metal...
The one-letter sequence is: WATER
a) Draw the peptide (R-groups trans), indicating charges, in
predominant form found at pH = 0.
b) What is the isoelectric point?
c) What is the average charge on the population of peptide
macromolecules at pH = 2.2?
d) What is the average charge on the population of peptide
macromolecules at pH = 12.5?
TABLE 4.1 Amino Acid Alanine Arginine Asparagine Aspartic acid Cysteine....« Glutamic acid Glutamine Glycine Histidine Isoleucine Leucine Lysine … Methionine Phenylalanine...
6. (1 pt each) What type of interaction (hydrophobic, hydrophilic, salt bridge, disulfide) would you expect between the R groups of the following amino acids in the tertiary structure of a protein? a) cysteine and cysteine disultide b) aspartic acid and lysine c) tyrosine and water
The chemical structures of the 20 standard amino acids at pH 7, along with their 3 and 1 letter codes, are givern in alphabetical order below. While the oxygen and nitrogen atoms of the peptide bonds may serve as a donor atom to complex a metal ion, very often the ligands for the metal come from the amino acid side chains. Takea few moments to examine the chemical structures of the different side chains. Circle the side chains that you...
What amino acid is attached to a tRNA with the following anticodon: 5' GCA 3'? SECOND POSITION с A U phenyl- alanine tyrosine cysteine U serine U с A leucine stop stop tryptophan stop G histidine U с A с leucine proline arginine FIRST POSITION glutamine THIRD POSITION G U isoleucine asparagine serine A threonine A lysine arginine methionine G U с A valine G aspartic acid glutamic acid alanine glycine and start Cysteine Alanine Arginine Serine
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