BCH4024 Quiz 2

What are the names of the 7 non polar aliphatic amino acids

glycine, alanine, proline, valine, leucine, isoleucine, methionine

what are the names of the 3 aromatic amino acids

phenylalanine, tyrosine, trptophan

what are the names of the 5 polar uncharged amino acids

serine, threonine, cysteine, asparagine, glutamine

what are the names of the 3 positively charged amino acids

lysine, histidine, arginine

what are the names of the 2 negatively charged amino acids

aspartate, glutamate

where are the nonpolar amino acids often found

internal portions of proteins

is glycine optically active

glycine is not optically active because it has an extra H as its R group which makes it symetrical

what is the special structure of proline

proline is the only structure with a secondary amine where the amine is bound ot two carbons

what is the difference between glycine and alanine

alanine has a methyl group instead of two H groups like glycine

what is the difference between leucine and isoleucine

leucine has a branching V shape off of a single carbon whereas isoleucine has a methyl coming off of the starting carbon

name this amino acid

glycine

name this amino acid

alanine

name this amino acid

Proline

name this amino acid

Valine

name this amino acid

leucine

name this amino acid

isoleucine

name this amino acid

methionine

name this amino acid

phenylalanine

what is the difference between phenylalanine and alanine

phenylalanine has an aromatic ring comming off of a R group carbon.

name this amino acid

tyrosine

name this amino acid

tryptophan

name this amino acid

serine

name this amino acid

threonine

name this amino acid

cysteine

name this amino acid

asparagine

name this amino acid

glutamine

what is the difference between tyrosine and phenylalanine

tyrosine has an OH group on the para position of the 6 numbered ring

what do phenylalanine and tyrosine have in common

they both have an aromatic ring comming off of a R group carbon

what does tyrosine and tryptophane have in common

both have an aromatic ring

what does phenylalanine and tryptophan have in common

both have an aromatic ring

of all the amino acids which is the only one to have a double ring

tryptophan

comparing in terms of polarity of the 3 aromatic amino acids, which two are the more polar

tyrosine and tryptophan

of the three aromatic amino acids, which one contains a nitrogen that is not the standard amino group.

tryptophan

what amino acid readily forms a disulfide bond with another form of itself

cysteine

among the polar uncharged amino acids which amino acid(s) contain a sulfur

cysteine

among the polar uncharged amino acids which amino acid(s) contain a OH group

Serine and Threonine

what is the difference between Threonin and Serine

Serine only has 1 carbon in its R group whereas Threonine has 2 carbons one of which is a methyl

what is the difference between asparagine and glutamine

glutamine’s R group chain is one carbon longer than asparagine

in the polar uncharged amino acids which amino acids(s) have a amide group

asparagine and glutamine

what is the isoelectric point (pI)

it is the pH where the average amino acid charge is 0

what is the henderson-hasselbalch equation

pH (or pI) = pKa + log [A-]/[HA]

what is the equation used for calculating pI

pI = (pKa1+pKa2)/2

what is the total number of sequences possible for amino acids at each position

20n where n is the number of residues within the peptide