Suppose you have a peptide composed of 4 amino acids bonded together: glutamine, glycine, glutamic acid,...
Suppose you have a peptide composed of 4 amino acids bonded together: glutamine, glycine, glutamic acid, and the novel amino acid friendsamine, which has an ionizable side group with a pKa of 5.9. At pH 7.0, this peptide has a net charge of -2. What is the charge on the protonated form of the friendsamine side group? Explain how you determined the charge on the protonated friendsamine side group
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Suppose you have a peptide composed of 4 amino acids bonded
together: glutamine, glycine, glutamic acid,...
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...
20. Properties of a Buffer The amino acid glycine is often used as the main ingredient...
20. Properties of a Buffer The amino acid glycine is often used as the main ingredient of a buffer in biochemical experi- ments. The amino group of glycine, which has a pKa of 9.6, can exist either in the protonated form (-NH3 or as the free base (-NH2), because of the reversible equilibrium (a) In what pH range can glycine be used as an effective buffer due to its amino group? (b) In a 0.1 M solution of glycine at...
Lecture 3 Identify amino-/carboxy termini, and R-group on amino acid What is chirality? Identify a carbon...
Lecture 3 Identify amino-/carboxy termini, and R-group on amino acid What is chirality? Identify a carbon that is chiral (i.e., has 4 different groups attached) Chiral compounds rotate plane polarized light Memorize amino acid 1) structure, 2) classification (hydrophobic, aliphatic, aromatic, negatively charged, positively charged, polar uncharged) Be able to draw glycine (the generic amino acid) Given an amino acid structure and pKas of ionizable groups, be able to determine the charge at pH 1, pH 14, and pH 7...
Which three statements about amino acids are true? Use this chart of amino acid structures for...
Which three statements about amino acids are true? Use this chart of amino acid structures for reference. Lysine has one stereocenter (chiral center). Methionine is a thiol. The Leu side chain does not form hydrogen bonds with other amino acids. The form of glycine used by the human body is D-glycine. Ser and Thr are polar amino acids. Proline has an overall charge at physiological pH (7.4).
THIS IS BIOCHEMISTRY A peptide has a low pI value. Which of the following amino acids...
THIS IS BIOCHEMISTRY A peptide has a low pI value. Which of the following amino acids are likely to be present? Glycine Serine Valine Aspartic aci Arginine The R-groups of which of the following pairs of amino acids could participate in the formation of salt bridge electrostatic interaction? Alanine and valine Valine and lysine Lysine and glutamate Serine and isoleucine Asparagine and glutamine Which of the following interactions does NOT contribute to stabilizing tertiary structure? Hydrophobic interactions Electrostatic interations...
Suppose you are researching a special enzyme named "Generic Enzyme." Generic Enzyme has an amino acid...
Suppose you are researching a special enzyme named "Generic Enzyme." Generic Enzyme has an amino acid side chain functional group that must be in the protonated form for the enzyme to be active. You have just purified Generic Enzyme and found that 1 in every 4 individual Generic Enzyme molecules is active. Your special Generic Enzyme is at a pH of 7.75. Generic enzyme has a phenolic hydroxyl group which is responsible for its catalytic activity. What is the pKa...
60) Lipids are composed of: c) fatty acids and glycerol amino acids and glycerol nucleic acids...
60) Lipids are composed of: c) fatty acids and glycerol amino acids and glycerol nucleic acids and glycerol fatty acids and water fatty acids and sugar e) 61) The bond between two amino acids is a: a) hydrogen bond b) covalent bond c) peptide bond d) b and c e) none of the above 62) Hemoglobin has which tertiary structure: a) fibrous b) globular c) four subunits--two alpha chains, two beta chains d) alpha helix e) none of the above...
Draw L-aspartyl-L glutamine at pH 2. Aspartic acid has four carbons and two carboxylic acids. Glutamine...
Draw L-aspartyl-L glutamine at pH 2. Aspartic acid has four carbons and two carboxylic acids. Glutamine is the amide form of glutamic acid which is the next larger homolog of aspartic acid. a.) What is the dipeptide's pl? b.) What is the net charge of this dipeptide at pH 10? c.) At which of the following pH values would this dipeptide's sidechains be unable to form ionic bonds with like molecules? a.) 1 b.) 4 c.) 6 d.) 8 d.)...
15. Which is used to reduce the disulfide bonds in proteins? D) iodoacetate B) performic acid C) DTT A) PITC 16. Wh...
15. Which is used to reduce the disulfide bonds in proteins? D) iodoacetate B) performic acid C) DTT A) PITC 16. What is the net charge on the tripeptide Gly-Asp-Lys at pH 1.5? The table below gives the pKa's of the ionizable groups on the free amino acids. Free amino acid pK, of a-Carboxyl pKs of side chain pKa of a-amino group 2.4 group 9.8 Glycine Aspartate Lysine 2.0 3.9 9.9 2.2 9.1 10.5 A) -2 B) C) D) +2...
9. The bond linking together amino acids to form peptides is called a atom of atom...
9. The bond linking together amino acids to form peptides is called a atom of atom of the amine group. bond. This involves a covalent bond linking the the carboxylate group of one amino acid to the 10. Peptides are classi fied according to the number of amino acids linked together. As such, peptides containing 2, 3, and 4 amino acids would be classified as a(n) , and respectively. A peptide containing five or more amino acid is a(n) 11....
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...
20. Properties of a Buffer The amino acid glycine is often used as the main ingredient of a buffer in biochemical experi- ments. The amino group of glycine, which has a pKa of 9.6, can exist either in the protonated form (-NH3 or as the free base (-NH2), because of the reversible equilibrium (a) In what pH range can glycine be used as an effective buffer due to its amino group? (b) In a 0.1 M solution of glycine at...
Lecture 3 Identify amino-/carboxy termini, and R-group on amino acid What is chirality? Identify a carbon that is chiral (i.e., has 4 different groups attached) Chiral compounds rotate plane polarized light Memorize amino acid 1) structure, 2) classification (hydrophobic, aliphatic, aromatic, negatively charged, positively charged, polar uncharged) Be able to draw glycine (the generic amino acid) Given an amino acid structure and pKas of ionizable groups, be able to determine the charge at pH 1, pH 14, and pH 7...
Which three statements about amino acids are true? Use this chart of amino acid structures for reference. Lysine has one stereocenter (chiral center). Methionine is a thiol. The Leu side chain does not form hydrogen bonds with other amino acids. The form of glycine used by the human body is D-glycine. Ser and Thr are polar amino acids. Proline has an overall charge at physiological pH (7.4).
60) Lipids are composed of: c) fatty acids and glycerol amino acids and glycerol nucleic acids and glycerol fatty acids and water fatty acids and sugar e) 61) The bond between two amino acids is a: a) hydrogen bond b) covalent bond c) peptide bond d) b and c e) none of the above 62) Hemoglobin has which tertiary structure: a) fibrous b) globular c) four subunits--two alpha chains, two beta chains d) alpha helix e) none of the above...
15. Which is used to reduce the disulfide bonds in proteins? D) iodoacetate B) performic acid C) DTT A) PITC 16. What is the net charge on the tripeptide Gly-Asp-Lys at pH 1.5? The table below gives the pKa's of the ionizable groups on the free amino acids. Free amino acid pK, of a-Carboxyl pKs of side chain pKa of a-amino group 2.4 group 9.8 Glycine Aspartate Lysine 2.0 3.9 9.9 2.2 9.1 10.5 A) -2 B) C) D) +2...
9. The bond linking together amino acids to form peptides is called a atom of atom of the amine group. bond. This involves a covalent bond linking the the carboxylate group of one amino acid to the 10. Peptides are classi fied according to the number of amino acids linked together. As such, peptides containing 2, 3, and 4 amino acids would be classified as a(n) , and respectively. A peptide containing five or more amino acid is a(n) 11....
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