Homework Answers
K-R-G-P stands for Lysine-Arginine-Glycine-Proline. It is a polypeptide chain containing 4 amino acids and 3 peptide bonds. For a polypeptide chain containing n amino acids, there will be (n-1) peptide bonds.
A peptide bond is a -CONH- unit, and there is resonance present. Due to the resonance (shown in diagram) this region becomes planar (shaded region).
There are 3 asymmetric C centres (except glycine, as it has two
H groups). they are shown with asterisk.
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pulli 6) What is the sequence of amino acid specified by K-R-G-P, draw the amino acid...
1.) Draw the structure of the amino acid Serine(ser), which has R=-CH2-OH. Label the alpha carbon. 2.) Draw the dipeptid...
1.) Draw the structure of the amino acid Serine(ser), which has R=-CH2-OH. Label the alpha carbon. 2.) Draw the dipeptide that forms between serine and alanine. The dipeptide sequence is Ser-Ala. Label the peptide bond. 3.) How many amino acids residues are in a polypeptide containing 6 peptide bonds? How many peptide bonds are in a tripeptide 4.) Sketch a alpha-helix and a beta-sheet as best as you can. Label each.
PRELAB ASSIGNMENT 1 Draw the structure of the amino acid son CH-OH Label the alpha carbon...
PRELAB ASSIGNMENT 1 Draw the structure of the amino acid son CH-OH Label the alpha carbon acid Sorine (en) which has R MO CHE OH CH2 OH 2. Draw the dipeptide that forms betw the peptide bond. s between serine and alanine The dipeptide sequence is Ser Ala Lace CH NCH H, A - — сH — с CH2 OH 3. How many amino aci arty amino acid residues are in a polypeptide containing 6 peptide bonos How many peptide...
Please please help!! Consider three dipeptides: i) S-G-K ii) I-K-Y iii) V-P-T Draw peptide (i)...
Please please help!! Consider three dipeptides: i) S-G-K ii) I-K-Y iii) V-P-T Draw peptide (i) illustrating the resonance structures that limit free rotation around the peptide bonds on each side of the center amino acid Show which bonds have the angles we call phi () and psi (). This peptide represents a normal peptide on the Ramachandran diagram. Draw peptides (ii) and (iii) and label them with phi () and psi () (don’t do the resonance structures again). Which...
CHE 1211 L-General, Organic and Biological Chemistry Lab PROTEINS AND AMINO ACIDS Name: Date: Lab Instructor:...
CHE 1211 L-General, Organic and Biological Chemistry Lab PROTEINS AND AMINO ACIDS Name: Date: Lab Instructor: Lab Section: PRELAB ASSIGNMENT 1. Draw the structure of the amino acid Serine (Ser), which has R -CH2-OH. Label the alpha carbon 2. Draw the dipeptide that forms between serine and alanine. The dipeptide sequence is Ser-Ala. Label the peptide bond. 3. How many amino acid residues are in a polypeptide containing 6 peptide bonds? How many peptide bonds are in a tripeptide?
The following sequence is part of the DNA TEMPLATE for a 4 amino acid peptide that...
The following sequence is part of the DNA TEMPLATE for a 4 amino acid peptide that starts with Methionine. 5- TTATTCTTTAAT CAT-3 What would be the consequences of the highlighted A to be mutated to a G? Select one: a. The resulting peptide will likely be larger than the non-mutant peptide b. the primary sequence of the peptide will be different on one amino acid O C. The peptide sequence would be the same d. all the amino acids after...
The following sequence is part of the DNA TEMPLATE for a 4 amino acid peptide that...
The following sequence is part of the DNA TEMPLATE for a 4 amino acid peptide that starts with Methionine. 5'- TTATTCTTTAAT CAT-3' What would be the consequences of the highlighted A to be mutated to a G? Select one: a. the primary sequence of the peptide will be different on one amino acid b. all the amino acids after the mutation will be different than the non-mutant peptide c. The peptide sequence would be the same d. The resulting peptide...
questions e-f and g.and k. a) Use the 3 letter symbols for a 6 amino acid...
questions e-f and g.and k.
a) Use the 3 letter symbols for a 6 amino acid peptide chain containing at least one polar and at least one acidic or basic amino acid. (All at physiological pH.) Asp - Gly-Glu-Tyr- Phe- Ala OM b) Draw the primary structure with its peptide bonds, side chains, etc. in the correct order. CH3 NH - E-N -CH. - CH - C- 2-I U=0 -ch- & N-chi- CH₃ CH ₂ Coo CH н My Coo...
6. (a) Show the arrangement of the groups on the a carbon of the naturally occurring amino acids (draw out the stereoce...
6. (a) Show the arrangement of the groups on the a carbon of the naturally occurring amino acids (draw out the stereocentre). (b) What is the significance of chirality in the biological world? 7. (a) Sh (a) Show the repeating unit of the polypeptide chain in a protein and indicate the peptide bond. (b) What are the following structures of a protein (i) primary, (ii) secondary, (iii) tertiary and (iv) quaternary. 1. Polypeptides are the natural polymer of the naturally...
1. (a) Draw a zwitterionic amino acid with a side chain, R. (b) What are the...
1. (a) Draw a zwitterionic amino acid with a side chain, R. (b) What are the angles between the Ca bonds? (c) If this is a naturally occurring amino acid, which isomer is it, D or L? (d) Assuming the side chain has no ionizable group, at approximately what pH will the majority of this free amino acid have a net positive charge? A net negative charge?
2. (7 pts) What is the sequence of the following HEXAPEPTIDE? *PROVIDE WORK/ANSWER for B-F! (Use...
2. (7 pts) What is the sequence of the following HEXAPEPTIDE? *PROVIDE WORK/ANSWER for B-F! (Use deductive reasoning) Observations from Sequencing Experiments: A. The Sequence contains the following amino acids: Y, R, M, K, G,D B. Reaction with 1-fluoro-2,4-dinitrobenzene yielded DNP-G. C. Treatment with chymotrypsin yielded two tripeptides. D. Treatment with trypsin yielded three dipeptides. E. Treatment with carboxypeptidase yielded methionine. F. N-terminal sequencing of one of the chymotrypsin-produced tripeptides yielded DNP-K Explanation and summary of protein sequencing techniques •...
PRELAB ASSIGNMENT 1 Draw the structure of the amino acid son CH-OH Label the alpha carbon acid Sorine (en) which has R MO CHE OH CH2 OH 2. Draw the dipeptide that forms betw the peptide bond. s between serine and alanine The dipeptide sequence is Ser Ala Lace CH NCH H, A - — сH — с CH2 OH 3. How many amino aci arty amino acid residues are in a polypeptide containing 6 peptide bonos How many peptide...
CHE 1211 L-General, Organic and Biological Chemistry Lab PROTEINS AND AMINO ACIDS Name: Date: Lab Instructor: Lab Section: PRELAB ASSIGNMENT 1. Draw the structure of the amino acid Serine (Ser), which has R -CH2-OH. Label the alpha carbon 2. Draw the dipeptide that forms between serine and alanine. The dipeptide sequence is Ser-Ala. Label the peptide bond. 3. How many amino acid residues are in a polypeptide containing 6 peptide bonds? How many peptide bonds are in a tripeptide?
The following sequence is part of the DNA TEMPLATE for a 4 amino acid peptide that starts with Methionine. 5- TTATTCTTTAAT CAT-3 What would be the consequences of the highlighted A to be mutated to a G? Select one: a. The resulting peptide will likely be larger than the non-mutant peptide b. the primary sequence of the peptide will be different on one amino acid O C. The peptide sequence would be the same d. all the amino acids after...
The following sequence is part of the DNA TEMPLATE for a 4 amino acid peptide that starts with Methionine. 5'- TTATTCTTTAAT CAT-3' What would be the consequences of the highlighted A to be mutated to a G? Select one: a. the primary sequence of the peptide will be different on one amino acid b. all the amino acids after the mutation will be different than the non-mutant peptide c. The peptide sequence would be the same d. The resulting peptide...
questions e-f and g.and k.
a) Use the 3 letter symbols for a 6 amino acid peptide chain containing at least one polar and at least one acidic or basic amino acid. (All at physiological pH.) Asp - Gly-Glu-Tyr- Phe- Ala OM b) Draw the primary structure with its peptide bonds, side chains, etc. in the correct order. CH3 NH - E-N -CH. - CH - C- 2-I U=0 -ch- & N-chi- CH₃ CH ₂ Coo CH н My Coo...
6. (a) Show the arrangement of the groups on the a carbon of the naturally occurring amino acids (draw out the stereocentre). (b) What is the significance of chirality in the biological world? 7. (a) Sh (a) Show the repeating unit of the polypeptide chain in a protein and indicate the peptide bond. (b) What are the following structures of a protein (i) primary, (ii) secondary, (iii) tertiary and (iv) quaternary. 1. Polypeptides are the natural polymer of the naturally...
2. (7 pts) What is the sequence of the following HEXAPEPTIDE? *PROVIDE WORK/ANSWER for B-F! (Use deductive reasoning) Observations from Sequencing Experiments: A. The Sequence contains the following amino acids: Y, R, M, K, G,D B. Reaction with 1-fluoro-2,4-dinitrobenzene yielded DNP-G. C. Treatment with chymotrypsin yielded two tripeptides. D. Treatment with trypsin yielded three dipeptides. E. Treatment with carboxypeptidase yielded methionine. F. N-terminal sequencing of one of the chymotrypsin-produced tripeptides yielded DNP-K Explanation and summary of protein sequencing techniques •...
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