Answer the following seven questions (a through g) based upon a trpeptide sequen

Question

Answer the following seven questions (a through g) based upon a trpeptide sequence with the following amino acids (one-letter symbols are given) Q V E a) What are the full names of the amino acids? Spelling counts, but capitalization does not. For an acidic amino acid, assume it is ionized and use the -ate ending instead of -ic acid Q: glutamine V: valine E glutamic acid b) What are the three-letter abbreviations for the amino acids? V: val E: glu c) What is the overall charge of the most abundant tripeptide species at neutral pH (pH 7.0)? Number Enter your answer as a whole number d) At physiological pH, what is the best description of the chemical properties of the side chain (R group)? Q: polar, uncharged V: Select answer E: negatively charged e) What is the overall charge of the most abundant tripeptide species below pH 1.0? below... Number Enter your answer as a whole number f) What is the overall charge of the most abundant tripeptide species at pH 11.5? Number Enter your answer as a whole number g) What type of intermolecular force could the side chains form with water? (Note that these are interactions are with water, not with other amino acids.) O ionic interactions O hydrogen bonds o hydrophobic interactions

Explanation / Answer

For the given tripeptide

a) names of amino acids

Q : Glutamine   V : Valine       E : gluctamic acid

b) Three letter abbreviation for amino acids

Q : Gln     V : Val       E : Glu

c) Overall charge at neutral pH,

-1

d) At physiological pH, best description of the chemical properties of the side chain (R group),

Q : polar, charged        V : non-polar, uncharged           E : polar, charged

e) Overall charge at pH 1.0,

+1

f) Overall charge at pH 11.5,

-2

g) type of intermolecular force that the side chain could form with water,

hydrogen bonds

hydrophobic interactions

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