WorksheetsAmino Acids, pI, Peptide Bond
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
The configuration at the a -carbon of the vast majority of naturally occurring amino acids is ___.
a)
L
b)
D
2.
The depicted amino acid is
a)
glycine
b)
glutamate
c)
glutamine
3.
Threonine is a(n) ..... amino acid.
a)
nonpolar, aliphatic
b)
polar, uncharged
c)
aromatic
d)
positively charged
e)
negatively charged
4.
... has a pkR that is close to 7 and hence is commonly found at the active site of enzymes.
a)
Proline
b)
Cysteine
c)
Glycine
d)
Lysine
e)
Histidine
5.
Hydrophobic interaction occurs between .... R-groups
a)
nonpolar, aliphatic
b)
polar, uncharged
c)
aromatic
d)
positively charged
e)
negatively charged
6.
The only uncommon amino acid found in proteins that is modified pre-translation is ________.
a)
selenocysteine
b)
hydroxyproline
c)
hydroxylysine
d)
carboxyglutamate
7.
Carnitine
a)
transports fatty acids into the mitochondria
b)
is an intermediate of bile biochemistry
c)
is an intermediate of the urea cycle
d)
stores phosphate in muscle tissue
8.
The C-terminal amino acid in the depicted tripeptide is _____.
a)
leucine,
b)
isoleucine
c)
alanine
d)
tyrosine
9.
The pI of aspartate is ____. (pK1 = 1.88, pK2 = 9.60, pKR = 3.65)
a)
1.88
b)
2.77
c)
3.65
d)
6.63
e)
9.60
10.
Choose the correct answer.
a)
Every amide bond is a peptide bond.
b)
Every peptide bond is an amide bond.
100 %
