exam 2 boil 4374 questions with answers
True or false
only the extraceullar domains of membrane glycoproteins
are glycosylated - CORRECT ANSWERS ✔✔true
which of the following antibiotics inhibits transcription?
a)streptomycin
b)tertracycline
c)chloramphenicol
d)cyclcoheximide
e) rifamycin - CORRECT ANSWERS ✔✔e) rifamycin
which of the following phospholipids is the most abundant
in the plasma membrane of most eukaryotic cells ?
a)phosphatidyl ethanolamine
b)phosphatidyl serine
c)phosphatidyl choline
d)phosphatidyl inositol
e)sphingomyelin - CORRECT ANSWERS ✔✔c) phospahtidyl
choline
,the TATA box binding protine is a componenet of which of
the following general transcription factors?
a)TFIID
b)TFIIF
c)TFIIH
d)TFIIIH
e) non of the above - CORRECT ANSWERS ✔✔a)TFIID
how is the assymetrical distribution of phospholipids
across the plasma membrane created
a)phospholipids spontaneously flip-flop across the plasma
membrane
b)different phospholipids are synthesized in the cytosol
and ER lumen
c)phospholipids are redistributed by ABC transporters
d)some phospholipids are flipped across the membrane
during transit through the Golgi complex
e)the membrane lipids are not asymmetrically distributed
- CORRECT ANSWERS ✔✔c) phospholipids are redistributed
by ABC transporters
,which of the following lipids is most important in the
formation of lipid rafts
a)sphingomyclein
b)phosphatidylinositol
c)phosphatidyle serine
d)glycolipids
e)all of the above - CORRECT ANSWERS
✔✔a)sphingomyelin
which of the following modification would result in
increased membrane fluidity
a)increased cholesterol content
b)increased chain length of fatty acid tails
c)increased unsaturation of fatty acid tails
d)increased protin content
e)non od the above - CORRECT ANSWERS ✔✔c)increased
unsaturation of fatty acid tails
what is the role of the modified base, 7-methylguanosine
a)it is formed during chromatin remodeling
, b)it forms the 5'cap of messenger RNA
c)it marks the 5' spice site exon
d)it is produced sponataneously as a point mutation
e)none of the above - CORRECT ANSWERS ✔✔b)it forms
the 5'cap of messenger RNA
which of the following mechanisms is capable of
repeating double stran breaks in DNAwithout loss of
sequence information
a)homologous recombination
b)non-homologous recombination
c)DNA mismatch repair
c)chromatin remodeling
e)reverse transcription - CORRECT ANSWERS
✔✔a)homologous recombination
neurotransmitter release requires the activation of which
of the following ion channels
a)potassium leak channels
b)voltage-gated sodium channels
c. voltage-gated potassium channels
True or false
only the extraceullar domains of membrane glycoproteins
are glycosylated - CORRECT ANSWERS ✔✔true
which of the following antibiotics inhibits transcription?
a)streptomycin
b)tertracycline
c)chloramphenicol
d)cyclcoheximide
e) rifamycin - CORRECT ANSWERS ✔✔e) rifamycin
which of the following phospholipids is the most abundant
in the plasma membrane of most eukaryotic cells ?
a)phosphatidyl ethanolamine
b)phosphatidyl serine
c)phosphatidyl choline
d)phosphatidyl inositol
e)sphingomyelin - CORRECT ANSWERS ✔✔c) phospahtidyl
choline
,the TATA box binding protine is a componenet of which of
the following general transcription factors?
a)TFIID
b)TFIIF
c)TFIIH
d)TFIIIH
e) non of the above - CORRECT ANSWERS ✔✔a)TFIID
how is the assymetrical distribution of phospholipids
across the plasma membrane created
a)phospholipids spontaneously flip-flop across the plasma
membrane
b)different phospholipids are synthesized in the cytosol
and ER lumen
c)phospholipids are redistributed by ABC transporters
d)some phospholipids are flipped across the membrane
during transit through the Golgi complex
e)the membrane lipids are not asymmetrically distributed
- CORRECT ANSWERS ✔✔c) phospholipids are redistributed
by ABC transporters
,which of the following lipids is most important in the
formation of lipid rafts
a)sphingomyclein
b)phosphatidylinositol
c)phosphatidyle serine
d)glycolipids
e)all of the above - CORRECT ANSWERS
✔✔a)sphingomyelin
which of the following modification would result in
increased membrane fluidity
a)increased cholesterol content
b)increased chain length of fatty acid tails
c)increased unsaturation of fatty acid tails
d)increased protin content
e)non od the above - CORRECT ANSWERS ✔✔c)increased
unsaturation of fatty acid tails
what is the role of the modified base, 7-methylguanosine
a)it is formed during chromatin remodeling
, b)it forms the 5'cap of messenger RNA
c)it marks the 5' spice site exon
d)it is produced sponataneously as a point mutation
e)none of the above - CORRECT ANSWERS ✔✔b)it forms
the 5'cap of messenger RNA
which of the following mechanisms is capable of
repeating double stran breaks in DNAwithout loss of
sequence information
a)homologous recombination
b)non-homologous recombination
c)DNA mismatch repair
c)chromatin remodeling
e)reverse transcription - CORRECT ANSWERS
✔✔a)homologous recombination
neurotransmitter release requires the activation of which
of the following ion channels
a)potassium leak channels
b)voltage-gated sodium channels
c. voltage-gated potassium channels
