BCH 3033 Exam 1 Questions With
Accurate Answers
properties of living systems - ANSWER complicated and highly organized,
structures serve functional purposes, actively engaged in energy
transformations, self replication
phosphodiester bonds - ANSWER store energy from sugars, high AE, require
enzyme
CHON - ANSWER 99% of all atoms in human body, lightesdt, bond versatility -
covalent bonds, abundant
properties of biomolecules - ANSWER have sense, informational, characteristic
3D structure
weak forces - ANSWER maintain strutcure, determine interaactions, narrow
range for life conditions
H bonding - ANSWER strong in water, not a true bond but strongest o all non
covalent interactions
ions - permanent dipoles - ANSWER hydrated ions in water
properties of water - ANSWER high heat capacity, polar bc of bent structure,
amphoteric, 4 H bonds per water in solid form
amphoteric - ANSWER H bond donor and acceptor
hydration shell - ANSWER ions hydrated in water
water forms _______ with polar solutes - ANSWER Hbonds
hydrophobic interactions with water - ANSWER increase in order = decrease in
entropy
clathrate - ANSWER nonpolar substrate surrounded by water
micelles - ANSWER hydrophilic heads out, hydrophobic tails in
pH = - ANSWER -log10 [H+]
, Ka = - ANSWER [H+][A-] / [HA]
pKa = - ANSWER -log Ka
lower pka = - ANSWER stronger acid
henderson hasselbalch equation - ANSWER pH = pKa + log10 [A-]/[HA]
buffers - ANSWER resist changes in pH, weak acid + conj base, use within 1 pH
unit of buffer pKa
extracellular buffer (bicarbonate) in our bodies - ANSWER CO2/H2CO3/HCO3-,
pH=7.4
Intracellular buffer in our bodies - ANSWER H2PO4-/HPO4^2-, pH=7.2
proline is an - ANSWER imino acid
amino acids are - ANSWER weak polyprotic acids
alpha carboxyl group pka - ANSWER 2
alpha amino group pKa - ANSWER 9
isoelectric point - ANSWER pH at which species is neutral
pI = - ANSWER (pKa1 + pKa2)/2
basic - ANSWER highest pKas, highest pIs
acidic - ANSWER lowest pKas, lowest pIs
carboxyl groups form - ANSWER amides and esters
amino groups form - ANSWER sciff bases and amides
Cys (SH) residues form - ANSWER disulfides
all amino acids except __________ are __________ - ANSWER glycine, chiral
all amino acids used to make proteins are - ANSWER L
why is silica gel not used for amino acids? - ANSWER its too polar and the amino
acids wont move
Accurate Answers
properties of living systems - ANSWER complicated and highly organized,
structures serve functional purposes, actively engaged in energy
transformations, self replication
phosphodiester bonds - ANSWER store energy from sugars, high AE, require
enzyme
CHON - ANSWER 99% of all atoms in human body, lightesdt, bond versatility -
covalent bonds, abundant
properties of biomolecules - ANSWER have sense, informational, characteristic
3D structure
weak forces - ANSWER maintain strutcure, determine interaactions, narrow
range for life conditions
H bonding - ANSWER strong in water, not a true bond but strongest o all non
covalent interactions
ions - permanent dipoles - ANSWER hydrated ions in water
properties of water - ANSWER high heat capacity, polar bc of bent structure,
amphoteric, 4 H bonds per water in solid form
amphoteric - ANSWER H bond donor and acceptor
hydration shell - ANSWER ions hydrated in water
water forms _______ with polar solutes - ANSWER Hbonds
hydrophobic interactions with water - ANSWER increase in order = decrease in
entropy
clathrate - ANSWER nonpolar substrate surrounded by water
micelles - ANSWER hydrophilic heads out, hydrophobic tails in
pH = - ANSWER -log10 [H+]
, Ka = - ANSWER [H+][A-] / [HA]
pKa = - ANSWER -log Ka
lower pka = - ANSWER stronger acid
henderson hasselbalch equation - ANSWER pH = pKa + log10 [A-]/[HA]
buffers - ANSWER resist changes in pH, weak acid + conj base, use within 1 pH
unit of buffer pKa
extracellular buffer (bicarbonate) in our bodies - ANSWER CO2/H2CO3/HCO3-,
pH=7.4
Intracellular buffer in our bodies - ANSWER H2PO4-/HPO4^2-, pH=7.2
proline is an - ANSWER imino acid
amino acids are - ANSWER weak polyprotic acids
alpha carboxyl group pka - ANSWER 2
alpha amino group pKa - ANSWER 9
isoelectric point - ANSWER pH at which species is neutral
pI = - ANSWER (pKa1 + pKa2)/2
basic - ANSWER highest pKas, highest pIs
acidic - ANSWER lowest pKas, lowest pIs
carboxyl groups form - ANSWER amides and esters
amino groups form - ANSWER sciff bases and amides
Cys (SH) residues form - ANSWER disulfides
all amino acids except __________ are __________ - ANSWER glycine, chiral
all amino acids used to make proteins are - ANSWER L
why is silica gel not used for amino acids? - ANSWER its too polar and the amino
acids wont move
