BIOMG 3300 Prelim 1 (Units 1-5) Exam
Questions With Correct Answers
R1-R2C=NH |- |CORRECT |ANSWER✔✔-imine
RO-CO-CH3 |- |CORRECT |ANSWER✔✔-acetyl
R-SH |- |CORRECT |ANSWER✔✔-sulfhydryl/thiol
R-CO-SR |- |CORRECT |ANSWER✔✔-thioester
RO-PO2-OH |- |CORRECT |ANSWER✔✔-phosphoryl
hydrogen |bond |- |CORRECT |ANSWER✔✔-an |electrostatic |attraction |between |the |O |of |one |
molecule |and |the |H |of |another
H |must |be |bonded |to |F,O,N
H |bond |acceptor |- |CORRECT |ANSWER✔✔-a |LP |on |an |electronegative |atom
H |bond |donor |- |CORRECT |ANSWER✔✔-an |H |bonded |to |F,O,N
amphipathic |molecule |- |CORRECT |ANSWER✔✔-have |hydrophobic |and |hydrophilic |domains
,hydrophobic |molecules |- |CORRECT |ANSWER✔✔-nonpolar |molecules, |not |soluble |in |water
hydrophilic |molecules |- |CORRECT |ANSWER✔✔-polar |molecules, |dissolve |easily |in |water
Micelle |- |CORRECT |ANSWER✔✔-a |sphere-shaped |collection |of |amphipathic |molecules |held |
together |by |hydrophobic |interactions |in |a |polar |solvent. |The |hydrophilic |portions |face |the |
solvent, |and |the |hydrophobic |portions |face |inwards, |around |a |nonpolar |molecule.
Purpose |is |to |allow |nonpolar |molecules |such |as |lipids |to |dissolve |in |polar |solvents
van |der |waals |interactions |- |CORRECT |ANSWER✔✔-variations |in |the |electron |cloud |around |an |
atom |can |create |a |temporary |dipole. |Weak |attractions |between |uncharged |atoms |can |result
When |is |a |buffer |most |useful |- |CORRECT |ANSWER✔✔-when |the |pH |is |+/- |1 |unit |from |the |pka
When |does |pH=pka |- |CORRECT |ANSWER✔✔-at |the |half |equivalence |point. |For |AAs, |half |will |
be |protonated, |half |deprotonated
What |is |a |buffer? |- |CORRECT |ANSWER✔✔-a |mixture |of |a |weak |acid |and |its |conjugate |base. |
resists |changes |in |pKa
amino |acids |in |proteins |are |D |or |L? |- |CORRECT |ANSWER✔✔-L. |They |are |all |S |except |cysteine
L |AAs |- |CORRECT |ANSWER✔✔-have |the |NH3 |on |the |left
which |AA |is |achiral? |- |CORRECT |ANSWER✔✔-Glycine
, hydropathy |index |- |CORRECT |ANSWER✔✔-a |number |representing |the |hydrophobic/hydrophilic
|properties |of |its |side |chain |the |larger |the |number, |the |more |hydrophobic |the |AA
Which |AAs |can |hydrogen |bond |- |CORRECT |ANSWER✔✔-THAT |GLASTAG
thr, |hist, |arg, |tyr, |gln, |lys, |asn, |ser, |trp, |asp, |glu
Non |polar, |aliphatic |R |group |AAs |(hydrophobic) |- |CORRECT |ANSWER✔✔-MAP |VILG:
Met, |Ala, |Pro, |Val, |Ile, |Leu, |Gly
Aromatic |R |group |AAs |- |CORRECT |ANSWER✔✔-Phe, |Tyr, |Trp
Positively |charged |(basic) |AAs |- |CORRECT |ANSWER✔✔-Lys, |Arg, |His
Negatively |charged |(acidic) |R |group |AAs |- |CORRECT |ANSWER✔✔-Asp, |Glu
Polar, |uncharged |R |AAs |- |CORRECT |ANSWER✔✔-CAT |SG
Cys, |Asn, |Thr, |Gln, |Ser
R |groups |on |AA |Fisher |projections |- |CORRECT |ANSWER✔✔-always |drawn |on |the |bottom
Amino |acids |at |low |pH |(acidic |conditions) |- |CORRECT |ANSWER✔✔-fully |protonated
Zwitterions |- |CORRECT |ANSWER✔✔-neutrally |charged |amino |acids |(carboxyl |unprotonated, |
amino |group |protonated)
Questions With Correct Answers
R1-R2C=NH |- |CORRECT |ANSWER✔✔-imine
RO-CO-CH3 |- |CORRECT |ANSWER✔✔-acetyl
R-SH |- |CORRECT |ANSWER✔✔-sulfhydryl/thiol
R-CO-SR |- |CORRECT |ANSWER✔✔-thioester
RO-PO2-OH |- |CORRECT |ANSWER✔✔-phosphoryl
hydrogen |bond |- |CORRECT |ANSWER✔✔-an |electrostatic |attraction |between |the |O |of |one |
molecule |and |the |H |of |another
H |must |be |bonded |to |F,O,N
H |bond |acceptor |- |CORRECT |ANSWER✔✔-a |LP |on |an |electronegative |atom
H |bond |donor |- |CORRECT |ANSWER✔✔-an |H |bonded |to |F,O,N
amphipathic |molecule |- |CORRECT |ANSWER✔✔-have |hydrophobic |and |hydrophilic |domains
,hydrophobic |molecules |- |CORRECT |ANSWER✔✔-nonpolar |molecules, |not |soluble |in |water
hydrophilic |molecules |- |CORRECT |ANSWER✔✔-polar |molecules, |dissolve |easily |in |water
Micelle |- |CORRECT |ANSWER✔✔-a |sphere-shaped |collection |of |amphipathic |molecules |held |
together |by |hydrophobic |interactions |in |a |polar |solvent. |The |hydrophilic |portions |face |the |
solvent, |and |the |hydrophobic |portions |face |inwards, |around |a |nonpolar |molecule.
Purpose |is |to |allow |nonpolar |molecules |such |as |lipids |to |dissolve |in |polar |solvents
van |der |waals |interactions |- |CORRECT |ANSWER✔✔-variations |in |the |electron |cloud |around |an |
atom |can |create |a |temporary |dipole. |Weak |attractions |between |uncharged |atoms |can |result
When |is |a |buffer |most |useful |- |CORRECT |ANSWER✔✔-when |the |pH |is |+/- |1 |unit |from |the |pka
When |does |pH=pka |- |CORRECT |ANSWER✔✔-at |the |half |equivalence |point. |For |AAs, |half |will |
be |protonated, |half |deprotonated
What |is |a |buffer? |- |CORRECT |ANSWER✔✔-a |mixture |of |a |weak |acid |and |its |conjugate |base. |
resists |changes |in |pKa
amino |acids |in |proteins |are |D |or |L? |- |CORRECT |ANSWER✔✔-L. |They |are |all |S |except |cysteine
L |AAs |- |CORRECT |ANSWER✔✔-have |the |NH3 |on |the |left
which |AA |is |achiral? |- |CORRECT |ANSWER✔✔-Glycine
, hydropathy |index |- |CORRECT |ANSWER✔✔-a |number |representing |the |hydrophobic/hydrophilic
|properties |of |its |side |chain |the |larger |the |number, |the |more |hydrophobic |the |AA
Which |AAs |can |hydrogen |bond |- |CORRECT |ANSWER✔✔-THAT |GLASTAG
thr, |hist, |arg, |tyr, |gln, |lys, |asn, |ser, |trp, |asp, |glu
Non |polar, |aliphatic |R |group |AAs |(hydrophobic) |- |CORRECT |ANSWER✔✔-MAP |VILG:
Met, |Ala, |Pro, |Val, |Ile, |Leu, |Gly
Aromatic |R |group |AAs |- |CORRECT |ANSWER✔✔-Phe, |Tyr, |Trp
Positively |charged |(basic) |AAs |- |CORRECT |ANSWER✔✔-Lys, |Arg, |His
Negatively |charged |(acidic) |R |group |AAs |- |CORRECT |ANSWER✔✔-Asp, |Glu
Polar, |uncharged |R |AAs |- |CORRECT |ANSWER✔✔-CAT |SG
Cys, |Asn, |Thr, |Gln, |Ser
R |groups |on |AA |Fisher |projections |- |CORRECT |ANSWER✔✔-always |drawn |on |the |bottom
Amino |acids |at |low |pH |(acidic |conditions) |- |CORRECT |ANSWER✔✔-fully |protonated
Zwitterions |- |CORRECT |ANSWER✔✔-neutrally |charged |amino |acids |(carboxyl |unprotonated, |
amino |group |protonated)
