Draw a model of a very small section of a polypeptide, just 3-4 amino acids in...
Draw a model of a very small section of a polypeptide, just 3-4 amino acids in length. Relate this structure to the three main types of Secondary structure formed; α-helix, β-strand and turns. Be sure to show where each of the following is found on the polypeptide:
amine groups, carboxyl Groups , R-Groups , peptide bond, φ angles, ψ angles.
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Draw a model of a very small section of a polypeptide, just 3-4
amino acids in...
7.Draw the basic structure of an amino acid dimer (two amino acids bound together); label an...
7.Draw the basic structure of an amino acid dimer (two amino acids bound together); label an amine, carboxyl, side chainand peptide bond. 8.Define primary and tertiary protein structure. How does the tertiary structure depend on the primary structure?
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...
A small generic section of the primary structure of an α helix is given by −amino...
A small generic section of the primary structure of an α helix is given by −amino acid1−amino acid2−amino acid3−amino acid4−amino acid5−amino acid6−amino acid7− Which amino acid residue's backbone forms a hydrogen bond with the backbone of the third (3rd) residue? Which peptide segment is most likely to be part of a stable α helix at physiological pH ? −Glu−Leu−Ala−Lys−Phe− −Gly−Arg−Lys−His−Gly− −Gly−Gly−Gly−Ala−Gly− −Pro−Leu−Thr−Pro−Trp− −Lys−Lys−Ala−Arg−Ser− −Glu−Glu−Glu−Glu−Glu− −Tyr−Trp−Phe−Val−Ile−
6. The following polypeptide (30 amino acids) contains a great deal of regular secondary structure. (10)...
6. The following polypeptide (30 amino acids) contains a great deal of regular secondary structure. (10) (15) (20) lys Lys Ala-Phe-Trp-Met-His- GIh-Thr-lle-Arg-Ser-Gly-Ala-Gly-Ser-Gly-Ala-Trp-Tyr-Pro-Val-Ala (30) Phe-Met-Leu-Val-Pro-Glu-Glu There are at least two regions where alpha helical structure is found. Indicate the beginning and ending residues of these regions. Any group or groups which break the alpha helical structure should not be considered part of the helix. Remember that it take four residues to give a turn of an alpha helix, so that is...
QUESTION 13 What chemical group is at the end of an amino acid chain corresponding to...
QUESTION 13 What chemical group is at the end of an amino acid chain corresponding to the 3' end of the mRNA molecule? A. Peptide bond B.5 phosphate group C.3" hydroxyl group D. Amino (N-terminus) E. Carboxyl (C-terminus) QUESTION 14 Which of the following is true regarding pre-mRNA modifications/processing? O A. Alternative splicing allows for increased complexity and synthesis of protein isomers OB. The 5' cap is added after RNA polymerase dissociates from the gene OC. The poly A tail...
Determine whether the sentences are true or false 27-( ) The only acidic amino acid is...
Determine whether the sentences are true or false 27-( ) The only acidic amino acid is aspartic acid. 36-( ) The quaternary structure is physically very strong because many polypeptides are clustered together. 37-( ) The amino acid sequence consisting of I-V-V-F-V is judged to form a β strand. 38-( ) The amino acid sequence consisting of A-E-A-E-L-A-L-E is judged to form an α-helix. 39-( ) If the molecular weight of glycine is 75, the molecular weight of the peptide...
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:...
Homework #11 (5 points) 1. Draw two amino acids. Circle around the carboxyl ends. Put a...
Homework #11 (5 points) 1. Draw two amino acids. Circle around the carboxyl ends. Put a double line und and the three-letter abbreviation for each amino acid. two amino acids. Circle the central carbon atoms. Underline the amino ends. Carboxyl ends. Put a double line under the R groups/ side chains. Write the name 2. How do enzymes increase the rate of chemical reactions? 3. What type of bond joins two amino acids together? 4. What are the three types...
1.)Carbohydrates are aldehydes or ketones that contain multiple ___________ groups. hydroxyl phosphate methyl amino 2.) The...
1.)Carbohydrates are aldehydes or ketones that contain multiple ___________ groups. hydroxyl phosphate methyl amino 2.) The type of lipid that contains a four-ring structure and does not contain fatty acids is: glycolipid. phospholipid. steroid. triglyceride. none of the above 3.)Amino acids contain a(n): "R" side chain. carboxylic acid group. amine group. all of the above none of the above 4.An alpha helix is an example of which type of structure? Primary Structure Secondary Structure Tertiary Structure Quaternary Structure Pental Structure...
Question 1 (0.5 points) Saved Proteins are formed by joining together. carboxylic acids fatty acids amino...
Question 1 (0.5 points) Saved Proteins are formed by joining together. carboxylic acids fatty acids amino acids none of the above Question 2 (0.5 points) Which two functional groups does an amino acid contain? amine and carboxylic acid carboxylic acid and amide amide and heterocyclic ring heterocyclic ring and amine Question 3 (0.5 points) Do amino acids commonly exist in nature as neutral molecules with all uncharged atoms? Yes No Question 1 (0.5 points) What is a protein? A polymer...
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...
6. The following polypeptide (30 amino acids) contains a great deal of regular secondary structure. (10) (15) (20) lys Lys Ala-Phe-Trp-Met-His- GIh-Thr-lle-Arg-Ser-Gly-Ala-Gly-Ser-Gly-Ala-Trp-Tyr-Pro-Val-Ala (30) Phe-Met-Leu-Val-Pro-Glu-Glu There are at least two regions where alpha helical structure is found. Indicate the beginning and ending residues of these regions. Any group or groups which break the alpha helical structure should not be considered part of the helix. Remember that it take four residues to give a turn of an alpha helix, so that is...
QUESTION 13 What chemical group is at the end of an amino acid chain corresponding to the 3' end of the mRNA molecule? A. Peptide bond B.5 phosphate group C.3" hydroxyl group D. Amino (N-terminus) E. Carboxyl (C-terminus) QUESTION 14 Which of the following is true regarding pre-mRNA modifications/processing? O A. Alternative splicing allows for increased complexity and synthesis of protein isomers OB. The 5' cap is added after RNA polymerase dissociates from the gene OC. The poly A tail...
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:...
Homework #11 (5 points) 1. Draw two amino acids. Circle around the carboxyl ends. Put a double line und and the three-letter abbreviation for each amino acid. two amino acids. Circle the central carbon atoms. Underline the amino ends. Carboxyl ends. Put a double line under the R groups/ side chains. Write the name 2. How do enzymes increase the rate of chemical reactions? 3. What type of bond joins two amino acids together? 4. What are the three types...
Question 1 (0.5 points) Saved Proteins are formed by joining together. carboxylic acids fatty acids amino acids none of the above Question 2 (0.5 points) Which two functional groups does an amino acid contain? amine and carboxylic acid carboxylic acid and amide amide and heterocyclic ring heterocyclic ring and amine Question 3 (0.5 points) Do amino acids commonly exist in nature as neutral molecules with all uncharged atoms? Yes No Question 1 (0.5 points) What is a protein? A polymer...
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