Unit 4: Chapter 3 Flashcards
Amino acid structure:
alpha carbon with:
amino group (NH3+)
Carboxylic Acid (COO-)
Hydrogen atom
R group
D amino acids can occur where
nature and mostly bacterial cell walls
D Isomer of amino acids indicate
Amino Group (NH3+) is on right
D amino acids not found in
proteins
L isomer of amino acids indicate
Amino group (NH3+) is on left
At pyshiological pH 7.4, what group will be pronotated?
NH3+ or COO-
Amino group
pKa > pH
At pyshiological pH 7.4, what group will be depronotated?
NH3+ or COO-
Carboxylic group
pKa < pH
Amino acids can be sorted into four groups on basis of
general characteristics of their R groups
Nonpolar side chains of amino acids indicate:
Hydrophobic
Polar side chains of amino acids indicate:
uncharged, hydrophillic, positively charged, negatively charged
Nonpolar amino acids are typically found where in the proteins?
Interior of proteins
Polar amino acids are typically found where in the proteins?
Surface of proteins
Which side chaisnare positively charged at pH 7?
KRH
Lysine, Arginine, Histidine
What amino acid can be uncharged or positively charged at neutral pH?
Histidine
What amino acids are negatively charged at neutral pH?
D, E
glutamic acid and aspartic acid
