1. 1 pt) Given the chart below, calculate the pl for the following tripeptide: H
ID: 3165220 • Letter: 1
Question
1. 1 pt) Given the chart below, calculate the pl for the following tripeptide: His-Met-Cys. Input your answer rounded to the nearest tenth. (Hint: draw the tripeptide first, then determine the ionizable groups.) lonizable groups inApproximate pKa in 3.1 Side chain c 6.0 8.0 8.3 10.8 10.9 12.5 a-amino Thiol E-amino Aromatic 2. (1 pt.) Answer the following questions in reference to the diagram below a) What structure is shown in the box in the diagram? Be specific. b) What type of bonds hold this type of structure together? 3. (1 pt) n is an example of what level of protein structure? a) Primary b) Secondary c) Tertiary d) Quaternary 4. (1 pt.) In forming polypeptides, is water used or released? What is the name for this type of reactioni? SPELLING COUNTS! (Each answer should be a single word) 5. (1 pt.) Which of the following statements about keratin is not correct? a) The disulfide bridges are formed between cysteine residues. b) The secondary structure of keratin is an extended a-helix. c) As a fibrous protein, keratin tends to be insoluble. d) Keratin's quaternary structure is held together primarily by hydrogen bonds.Explanation / Answer
1.Histidine pi=7.59, methionine pi=5.74+cysteine pI=5.07
Histidine+ methionine + cysteine
= 7.59+5.74+5.07=18.4
2. a. Beta pleated sheet is the structure that is shown.
b.Hydrogen bonds is present.
3Preproinsulin is an amino acid of length 110 amino acid.Hence, it exist in primary structure.
4. Dehydration reaction is involve , means water is released during the formation of polypeptide bond.
6.Yes, protein function is dependent on the protein structure. Hence, option a is correct which is true.
7. All given option are available.
8. Serine is less likely to found in alpha helix. Hence, option C is correct.
9.All the methods can denature the protein.Hence, option E is correct.
10. It is true.
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