Question 1

What is the difference between a transposon move and a retrotransposon move?

Accepted Answer

Transposons move by a cut-and-paste mech

Question 2

The function of the   -clamp is to

Accepted Answer

A)  keep the torsional strain reduced. 
B)  add the RNA primer. 
C)  keep the Pol III complex associated with the DNA. 
D)  separate the DNA into a single strand. 
A)  keep the torsional strain reduced. 
B)  add the RNA primer. 
C)  keep the Pol III complex associated with the DNA. 
D)  separate the DNA into a single strand.

Question 3

Bidirectional replication is defined as replication

Accepted Answer

A)  with one replication fork. 
B)  with two replication forks. 
C)  that unwinds the DNA completely to replicate. 
D)  that replicates the DNA in a given direction. 
A)  with one replication fork. 
B)  with two replication forks. 
C)  that unwinds the DNA completely to replicate. 
D)  that replicates the DNA in a given direction.

Question 4

Describe how Okazaki fragments allow for simultaneous synthesis of double-stranded DNA.

Accepted Answer

For double-stranded DNA to be continuous

Question 5

Lysogeny by bacteriophages causes what result to the host DNA?

Accepted Answer

A)  integration of virus DNA into host DNA 
B)  production of new bacteriophage particles 
C)  cell death 
D)  formation of Holliday junctions 
A)  integration of virus DNA into host DNA 
B)  production of new bacteriophage particles 
C)  cell death 
D)  formation of Holliday junctions

Question 6

Why do helicase and gyrase need to work together?

Accepted Answer

A)  Gyrase adds the RNA primer and helicase removes it. 
B)  Helicase unwinds DNA and gyrase relieves the torsional strain. 
C)  Helicase synthesizes DNA and gyrase prevents helicase from dissociating. 
D)  Gyrase synthesizes RNA primers and helicase. 
A)  Gyrase adds the RNA primer and helicase removes it. 
B)  Helicase unwinds DNA and gyrase relieves the torsional strain. 
C)  Helicase synthesizes DNA and gyrase prevents helicase from dissociating. 
D)  Gyrase synthesizes RNA primers and helicase.

Question 7

Base excision repair removes which kind of bases?

Accepted Answer

A)  mismatched 
B)  methylated 
C)  those damaged by ROS 
D)  uracil 
A)  mismatched 
B)  methylated 
C)  those damaged by ROS 
D)  uracil

Question 8

When a cytosine is deaminated to form uracil and removed by glycosylase enzymes,a __________ site is generated.

Accepted Answer

A)  nonbasic 
B)  abasic 
C)  dibasic 
D)  deaminated 
A)  nonbasic 
B)  abasic 
C)  dibasic 
D)  deaminated

Question 9

Describe the Ames test.

Accepted Answer

The test determines whether or not a sub

Question 10

What is NOT a likely repair system used if a strand of DNA has a pyrimidine dimer?

Accepted Answer

A)  mismatch repair 
B)  direct repair pathway 
C)  base excision 
D)  nucleotide excision 
A)  mismatch repair 
B)  direct repair pathway 
C)  base excision 
D)  nucleotide excision

Question 11

An advantage of viral DNA using LTR to produce a four-nucleotide overhang on the 3' end is to

Accepted Answer

A)  start replication. 
B)  help with alignment of the viral DNA to the host DNA. 
C)  start a base mismatch repair sequence. 
D)  help with cell meiosis. 
A)  start replication. 
B)  help with alignment of the viral DNA to the host DNA. 
C)  start a base mismatch repair sequence. 
D)  help with cell meiosis.

Question 12

Methenyltetrahydrofolate (MTHF)absorbs light to form *MTHF.What does the star on MTHF signify?

Accepted Answer

A)  radical 
B)  excited 
C)  cation 
D)  anion 
A)  radical 
B)  excited 
C)  cation 
D)  anion

Question 13

Using the figure below,identify conservative replication,dispersive replication,and semiconservative replication.

Accepted Answer

In this image conservative rep

Question 14

What is the specific site on the E.coli genome where DNA replication can initiate?

Accepted Answer

A)  oriC 
B)  DnaA 
C)  primase 
D)  SeqA 
A)  oriC 
B)  DnaA 
C)  primase 
D)  SeqA

Question 15

Semiconservative,as it relates to DNA replication,can be defined as when the original duplex DNA template

Accepted Answer

A)  remains intact to make a new DNA duplex. 
B)  is broken into fragments. 
C)  is separated into single strands before replications. 
D)  can only be replicated once. 
A)  remains intact to make a new DNA duplex. 
B)  is broken into fragments. 
C)  is separated into single strands before replications. 
D)  can only be replicated once.

Question 16

Which of the following best describes base excision?

Accepted Answer

A)  removal and replacement of individual bases that have been damaged by various chemical reactions 
B)  repair of large lesions that distort DNA 
C)  removal of individual bases that have been phosphorylated 
D)  repair of small lesions that distort DNA 
A)  removal and replacement of individual bases that have been damaged by various chemical reactions 
B)  repair of large lesions that distort DNA 
C)  removal of individual bases that have been phosphorylated 
D)  repair of small lesions that distort DNA

Question 17

What is the mechanism by which replication errors are fixed in E.coli?

Accepted Answer

A)  degrading of the entire DNA strand to start over 
B)  base excision 
C)  mismatch repair 
D)  abasic repair 
A)  degrading of the entire DNA strand to start over 
B)  base excision 
C)  mismatch repair 
D)  abasic repair

Question 18

Spending time in the sun is a possible cause of DNA damage because UV radiation

Accepted Answer

A)  causes an abasic site to form. 
B)  produces photoproducts. 
C)  causes protein misfolding. 
D)  produces methylated thymidine. 
A)  causes an abasic site to form. 
B)  produces photoproducts. 
C)  causes protein misfolding. 
D)  produces methylated thymidine.

Question 19

What would a possible outcome be if all eukaryotic cells had telomerase activity?

Accepted Answer

A)  Cells would die sooner. 
B)  Cells would have increased synthesis. 
C)  The rate of synthesis would increase. 
D)  Cells would live indefinitely. 
A)  Cells would die sooner. 
B)  Cells would have increased synthesis. 
C)  The rate of synthesis would increase. 
D)  Cells would live indefinitely.

Question 20

DNA photolyase specifically seeks out what kind of DNA damage?

Accepted Answer

A)  base mismatch 
B)  abasic sites 
C)  pyrimidine dimers 
D)  phosphorylated base 
A)  base mismatch 
B)  abasic sites 
C)  pyrimidine dimers 
D)  phosphorylated base

Exam 20: Dna Replication, repair, and Recombination

What is the difference between a transposon move and a retrotransposon move?

The function of the -clamp is to

Bidirectional replication is defined as replication

Describe how Okazaki fragments allow for simultaneous synthesis of double-stranded DNA.

Lysogeny by bacteriophages causes what result to the host DNA?

Why do helicase and gyrase need to work together?

Base excision repair removes which kind of bases?

When a cytosine is deaminated to form uracil and removed by glycosylase enzymes,a __________ site is generated.

Describe the Ames test.

What is NOT a likely repair system used if a strand of DNA has a pyrimidine dimer?

An advantage of viral DNA using LTR to produce a four-nucleotide overhang on the 3' end is to

Methenyltetrahydrofolate (MTHF)absorbs light to form *MTHF.What does the star on MTHF signify?

Using the figure below,identify conservative replication,dispersive replication,and semiconservative replication.

What is the specific site on the E.coli genome where DNA replication can initiate?

Semiconservative,as it relates to DNA replication,can be defined as when the original duplex DNA template

Which of the following best describes base excision?

What is the mechanism by which replication errors are fixed in E.coli?

Spending time in the sun is a possible cause of DNA damage because UV radiation

What would a possible outcome be if all eukaryotic cells had telomerase activity?

DNA photolyase specifically seeks out what kind of DNA damage?

Principles of Biochemistry

Physical Biochemistry: Energy Conversion,water,and Membranes

Nucleic Acid Structure and Function

Protein Structure

Methods in Protein Biochemistry

Protein Function

Enzyme Mechanisms

Cell Signaling Systems

Glycolysis: a Paradigm of Metabolic Regulation

The Citrate Cycle

Oxidative Phosphorylation

Photosynthesis

Carbohydrate Structure and Function

Carbohydrate Metabolism

Lipid Structure and Function

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Metabolic Integration

Rna Synthesis, processing, and Gene Silencing

Protein Synthesis, posttranslational Modification, and Transport

Gene Regulation

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