BIOCHEMISTRY EXAM STUDY QUESTIONS AND ANSWERS

BIOCHEMISTRY EXAM STUDY
QUESTIONS AND ANSWERS


Alanine (ala) - CORRECT ANSWER-nonpolar
aliphatic

Glycine (gly) - CORRECT ANSWER-nonpolar
aliphatic

Valine (val) - CORRECT ANSWER-nonpolar
aliphatic
branched chain

Leucine (leu) - CORRECT ANSWER-nonpolar
aliphatic
branched chain

Isoleucine (ile) - CORRECT ANSWER-nonpolar
aliphatic
branched chain

Proline (pro) - CORRECT ANSWER-nonpolar
aliphatic
ring structure that is not aromatic

Phenylalanine (phe) - CORRECT ANSWER-nonpolar
aromatic
permits absorption of UV light at 280 nm

Tyrosine (tyr) - CORRECT ANSWER-polar and nonpolar
properties
-amphipathic
uncharged

,aromatic
OH group

Tryptophan (trp) - CORRECT ANSWER-nonpolar
aromatic
permits absorption of UV light at 280 nm

Serine (ser) - CORRECT ANSWER-polar
uncharged
OH group

Threonine (thr) - CORRECT ANSWER-polar
uncharge
OH group

Cysteine (cys) - CORRECT ANSWER-polar
uncharged
SH group
-groups can become oxidized and form disulfide bonds to each
other (S-S)

Asparagine (asn) - CORRECT ANSWER-polar
uncharged
carboxamide group

Methionine (met) - CORRECT ANSWER-nonpolar
aliphatic
thioether

Glutamine (gln) - CORRECT ANSWER-polar
uncharged
carboxamide group

Lysine (lys) - CORRECT ANSWER-polar
charged
positive

, Arginine (arg) - CORRECT ANSWER-polar
charged
positive

Histidine (his) - CORRECT ANSWER-polar
charged
positive
pKa 6, close to physiological
can act as acid or base

Aspartic acid (asp) - CORRECT ANSWER-polar
charged
negative

Glutamic acid (glu) - CORRECT ANSWER-polar
charged
negative

What makes water essential for life? - CORRECT ANSWER--
solvent
-organizing principle
-can be reactant or product in reaciton

Common electronegative atoms in biological systems -
CORRECT ANSWER-Oxygen>Nitrogen>Sulfur

Types of Noncovalent Interactions - CORRECT ANSWER-
Hydrogen Bonding
Electrostatic, Ionic interactions
Van der Waals force
Hyrdrophobic interactions

Hydrogen bonds - CORRECT ANSWER-btwn electronegative
atom (acceptor) and an H atom that is covalently bonded to
another atom (donor)
-dont last very long
-weak association