BIOCHEMISTRY REVIEW Overview of Biomoleculesmed.fau.edu/students/md_m1_orientation/Chapter11.pdfAre...
Transcript of BIOCHEMISTRY REVIEW Overview of Biomoleculesmed.fau.edu/students/md_m1_orientation/Chapter11.pdfAre...
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BIOCHEMISTRY REVIEW
Overview of Biomolecules
Chapter 11
DNA Replication
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Are You Getting It??
____________________________________________________
____________________________________________________
Which characteristics will be part of semi-conservative replication? (multiple answers)
a) The two old DNA strands will separate.
b) The two new DNA strands form a double-helix.
c) Each DNA strand has a mixture of old DNA and new DNA.
d) Each new DNA strand is complementary to an old strand.
e) The old DNA strands are conserved while the new
strands are dispersed.
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Are You Getting It??
____________________________________________________
______________________Answer________________________
Which characteristics will be part of semi-conservative replication?
a) The two old DNA strands will separate.
b) The two new DNA strands form a double-helix.
c) Each DNA strand has a mixture of old DNA and new DNA.
d) Each new DNA strand is complementary to an old strand.
e) The old DNA strands are conserved while the new
strands are dispersed.
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Are You Getting It??
____________________________________________________
____________________________________________________
Which types of DNA will band with hybrid density in CsCl density gradients after one generation when old DNA contains 15N while new DNA contains 14N? (multiple answers)
a) A double-stranded DNA molecule made by
conservative replication.
b) A double-stranded DNA molecule made by
semi-conservative replication.
c) A double-stranded DNA molecule made by
dispersive replication. 12
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Are You Getting It??
____________________________________________________
_____________________Answer_________________________
Which types of DNA will band with hybrid density in CsCl density gradients after one generation when old DNA contains 15N while new DNA contains 14N?
a) A double-stranded DNA molecule made by
conservative replication.
b) A double-stranded DNA molecule made by
semi-conservative replication.
c) A double-stranded DNA molecule made by
dispersive replication.13
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Are You Getting It??
____________________________________________________
____________________________________________________
Which properties can be found in a replicating E. coli DNA molecule? (multiple answers)
a) Replication always starts at the origin.
b) Replication is normally unidirectional.
c) A replicating molecule can have two forks.
d) The rate of replication is constant at 37o C.
e) Only one round of replication can occur at any time.
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Are You Getting It??
____________________________________________________
______________________Answer________________________
Which properties can be found in a replicating E. coli DNA molecule?
a) Replication always starts at the origin.
b) Replication is normally unidirectional.
c) A replicating molecule can have two forks.
d) The rate of replication is constant at 37o C.
e) Only one round of replication can occur at any time.
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Are You Getting It??
____________________________________________________
____________________________________________________
Which components are necessary for DNA replication?
(multiple answers)
a) a DNA template
b) a complementary primer
c) deoxyribonucleoside triphosphates
d) base-pairing
e) release of pyrophosphate
f) formation of phosphodiester bonds
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Are You Getting It??
____________________________________________________
______________________Answer________________________
Which components are necessary for DNA replication?
a) a DNA template
b) a complementary primer
c) deoxyribonucleoside triphosphates
d) base-pairing
e) release of pyrophosphate
f) formation of phosphodiester bonds
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Are You Getting It??
____________________________________________________
____________________________________________________
Which property is shared by E. coli DNA polymerases I, II, and III?
a) They all contain multiple subunits.
b) They all have similar molecular weights.
c) They all function in replication.
d) They all add nucleotides to the 3’- end.
e) They all polymerize at the same rate.
f) They all have the same processivity.
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Are You Getting It??
____________________________________________________
_____________________Answer_________________________
Which property is shared by E. coli DNA polymerases I, II, and III?
a) They all contain multiple subunits.
b) They all have similar molecular weights.
c) They all function in replication.
d) They all add nucleotides to the 3’- end.
e) They all polymerize at the same rate.
f) They all have the same processivity.
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Are You Getting It??
____________________________________________________
____________________________________________________
Which events occur during initiation of replication in E. coli?
(multiple answers)
a) DNA is denatured with the help of proteins.
b) All replication proteins are needed at the origin.
c) DNA polymerase binds to repeated sequences.
d) The frequency of DNA replication is controlled.
e) The origin is degraded as replication starts.
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Are You Getting It??
____________________________________________________
_____________________Answer________________________
Which events occur during initiation of replication in E. coli?
a) DNA is denatured with the help of proteins.
b) All replication proteins are needed at the origin.
c) DNA polymerase binds to repeated sequences.
d) The frequency of DNA replication is controlled.
e) The origin is degraded as replication starts.
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Are You Getting It??
____________________________________________________
____________________________________________________
Which characteristics are found in an E. coli replication fork?
(multiple answers)
a) There are two leading strands.
b) There are two lagging strands.
c) All DNA is made with Okazaki pieces.
d) All Okazaki pieces start with an RNA primer.
e) Replication is semi-discontinuous.
f) An Okazaki pieces has ~1000 nucleotides.
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Are You Getting It??
____________________________________________________
______________________Answer________________________
Which characteristics are found in an E. coli replication fork?
a) There are two leading strands.
b) There are two lagging strands.
c) All DNA is made with Okazaki pieces.
d) All Okazaki pieces start with an RNA primer.
e) Replication is semi-discontinuous.
f) An Okazaki pieces has ~1000 nucleotides.
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Are You Getting It??
____________________________________________________
____________________________________________________
Match the replication protein with its function.
a) helicase i) seals nicks
b) pol I ii) adjusts supercoiling
c) ligase iii) maintains denatured DNA
d) topoisomerase iv) removes primers
e) SSB v) unwinds the double-helix
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Are You Getting It??
____________________________________________________
_____________________Answer_________________________
Match the replication protein with its function.
a) helicase unwinds the double-helix
b) pol I removes primers
c) ligase seals nicks
d) topoisomerase adjusts supercoiling
e) SSB maintains denatured DNA
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Are You Getting It??
____________________________________________________
____________________________________________________
Which replication proteins are needed for elongation of
the leading strand or the lagging strand?
a) pol I
b) pol III
c) Dna A
d) Dna B
e) primase
f) ligase
g) gyrase 65
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Are You Getting It??
____________________________________________________
_____________________Answer_________________________
Which replication proteins are needed for elongation of
the leading strand or the lagging strand?
a) pol I lagging
b) pol III both
c) Dna A neither
d) Dna B both
e) primase lagging
f) ligase lagging
g) gyrase both 66
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PROOF-READING
3’ 5’ 5’ 3’
3’ ____________ 5’_____________
5’ __________OH 3’__________PPP
3’____________ 5’_____________
5’________OH 3’________P
polymerization can polymerization can’t
continue continue75
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Are You Getting It??
____________________________________________________
____________________________________________________
Which are properties of the proof-reading activity of
E. coli DNA polymerases? (multiple answers)
a) It is present in both pol I and pol III.
b) It works on the lagging strand but not the leading strand.
c) It is a 3’→ 5’ exonuclease activity.
d) It recognizes a mismatched base.
e) It works only on methylated DNA.
f) It works on primers.
g) It breaks a phosphodiester bond. 77
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Are You Getting It??
____________________________________________________
______________________Answer________________________
Which are properties of the proof-reading activity of
E. coli DNA polymerases?
a) It is present in both pol I and pol III.
b) It works on the lagging strand but not the leading strand.
c) It is a 3’→ 5’ exonuclease activity.
d) It recognizes a mismatched base.
e) It works only on methylated DNA.
f) It works on primers.
g) It breaks a phosphodiester bond. 78
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Are You Getting It??
____________________________________________________
____________________________________________________
Which aspects of DNA replication are found in
prokaryotes or eukaryotes?
a) multiple origins
b) multiple Okazaki pieces
c) RNA primers
d) bidirectional replication
e) telomerase
f) proof-reading
g) S phase 85
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Are You Getting It??
____________________________________________________
_____________________Answer_________________________
Which aspects of DNA replication are found in
prokaryotes or eukaryotes?
a) multiple origins eukaryotes
b) multiple Okazaki pieces both
c) RNA primers both
d) bidirectional replication both
e) telomerase eukaryotes
f) proof-reading both
g) S phase eukaryotes 86