y-C CHEM 4033- Spring18-LI> Activities and Due Dates Ch3a: Amino Acids and Pepti
ID: 1031580 • Letter: Y
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y-C CHEM 4033- Spring18-LI> Activities and Due Dates Ch3a: Amino Acids and Peptides 8 06.00 PM 92/1003/23/2018 12:33 PM Print lCalculatnr-Per odic Table apling Learning Map, Answer the folcwing seven questions (a through g) based upon a tripeptidle sequence with the folowing amino acids (one leter symbols are given): S V E a) What are the fuil names of the amino acids? Speling counts, but capitaizatian does not For an acidic amino acid, assume it is ionized and use the- ate ending instead of -le acid s. rline "amino acid nama arrectly in part (at That wil be a/ed "X, by tho nore names you have wrong at is the overali charge of the most abundant tipeptide species at neutral phy ipH 7 0)? Enter your anwer At phyidiogical pH. whst is the teist cescrptan of the chemscal properties of the ade chan e groupy e) What is te averl charge at the moz aoundani tricsptseExplanation / Answer
a. S = Serine. V= Valine. E = Glutamate.
b. S = Ser. V = Val. E = Glu.
c. At ph=7, overall charge initripeptide is -1, because of carboxylic acid side chain of glutamate.
d. At physiological pH, Serine is neutral, valine is neutral, glutamate is negatively charged.
e. Below pH=1, overall charge is +1 because of one NH3+(all are protonated).
f. At ph=11.5 ,all are deprotonated,so overall charge of tripeptide is -2,one for carboxylic acid side chain of glutamate and another is for carboxylic acid end side of tripeptide.
g. Intermolecular force here is hydrogen bonding.
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