Intro to Molecular Cell Biology Test Bank
Chapter 6 Exam Questions and Answers
(Verified Answers) ||ACTUAL EXAM 2025
TEST!! Graded A+ | 2025|2026 EXAM
UPDATE
The process of DNA replication requires that each of the parental DNA strands be used
as a ____________ to produce a duplicate of the opposing strand.
(a) catalyst
(b) competitor
(c) template
(d) copy -CORRECTANSWER (c) template
DNA replication is considered semiconservative because
__________________________________.
(a) after many rounds of DNA replication, the original DNA double helix is still intact.
(b) each daughter DNA molecule consists of two new strands copied form the parent
(c) each daughter DNA molecule consists of one strand from the parent DNA molecule
and one new strand. -CORRECTANSWER (c) each daughter DNA molecule consists of
one strand from the parent DNA molecule and one new strand
,The classic experiment conducted by Meselson and Stahl demonstrated that DNA
replication is accomplished by employing a ______________ mechanism. -
CORRECTANSWER semiconservative
Initiator proteins bind to replication origins and disrupt hydrogen bonds between the two
DNA strands being copied. Which of the factors below does not contribute to the relative
ease of strand separation by initiator proteins?
(a) replication origins are rich in A-T base pairs
(b) the reaction can occur at room temperature
(c) they only separate a few base pairs at a time
(d) once opened, other portions of the DNA replication machinery bind to the origin -
CORRECTANSWER (b) the reaction can occur at room temperature
If the genome of the bacterium E. coli requires about 20 minutes to replicate itself, how
can the genome of a fruit fly be replicated in only 3 minutes?
(a) The fruit fly genome is smaller than E coli
(b) Eukaryotic DNA polymerase synthesizes DNA at a much faster rate than prokaryotic
(c) The nuclear membrane keeps the fruit fly DNA concentrated in one place in the cell,
which increases the rate of polymerization
(d) Fruit fly DNA contains more origins of replication than E coli DNA. -
CORRECTANSWER (d) Fruit fly DNA contains more origins of replication than E coli
DNA
, True or false?
When DNA is being replicated inside a cell, local heating occurs, allowing the two
strands to separate. -CORRECTANSWER False. This is accomplished by initiated
proteins binding at the origin of replication.
True or false?
DNA replication origins are typically rich in G-C base pairs. -CORRECTANSWER They
are rich in A-T base pairs which makes it easier for them to separate the strands
because they are only held together by two hydrogen bonds
True or false?
Meselson and Stahl ruled out the dispersive model for DNA replication. -
CORRECTANSWER true
True or false?
DNA replication is a bidirectional process that is initiated at multiple locations among
chromosomes in eukaryotic cells. -CORRECTANSWER True
How many replication forks are formed when an origin of replication is opened? -
CORRECTANSWER 2
How does the total number of replication origins in bacterial cells compare with the
number of origins in human cells? -CORRECTANSWER 1 versus 10,000
Chapter 6 Exam Questions and Answers
(Verified Answers) ||ACTUAL EXAM 2025
TEST!! Graded A+ | 2025|2026 EXAM
UPDATE
The process of DNA replication requires that each of the parental DNA strands be used
as a ____________ to produce a duplicate of the opposing strand.
(a) catalyst
(b) competitor
(c) template
(d) copy -CORRECTANSWER (c) template
DNA replication is considered semiconservative because
__________________________________.
(a) after many rounds of DNA replication, the original DNA double helix is still intact.
(b) each daughter DNA molecule consists of two new strands copied form the parent
(c) each daughter DNA molecule consists of one strand from the parent DNA molecule
and one new strand. -CORRECTANSWER (c) each daughter DNA molecule consists of
one strand from the parent DNA molecule and one new strand
,The classic experiment conducted by Meselson and Stahl demonstrated that DNA
replication is accomplished by employing a ______________ mechanism. -
CORRECTANSWER semiconservative
Initiator proteins bind to replication origins and disrupt hydrogen bonds between the two
DNA strands being copied. Which of the factors below does not contribute to the relative
ease of strand separation by initiator proteins?
(a) replication origins are rich in A-T base pairs
(b) the reaction can occur at room temperature
(c) they only separate a few base pairs at a time
(d) once opened, other portions of the DNA replication machinery bind to the origin -
CORRECTANSWER (b) the reaction can occur at room temperature
If the genome of the bacterium E. coli requires about 20 minutes to replicate itself, how
can the genome of a fruit fly be replicated in only 3 minutes?
(a) The fruit fly genome is smaller than E coli
(b) Eukaryotic DNA polymerase synthesizes DNA at a much faster rate than prokaryotic
(c) The nuclear membrane keeps the fruit fly DNA concentrated in one place in the cell,
which increases the rate of polymerization
(d) Fruit fly DNA contains more origins of replication than E coli DNA. -
CORRECTANSWER (d) Fruit fly DNA contains more origins of replication than E coli
DNA
, True or false?
When DNA is being replicated inside a cell, local heating occurs, allowing the two
strands to separate. -CORRECTANSWER False. This is accomplished by initiated
proteins binding at the origin of replication.
True or false?
DNA replication origins are typically rich in G-C base pairs. -CORRECTANSWER They
are rich in A-T base pairs which makes it easier for them to separate the strands
because they are only held together by two hydrogen bonds
True or false?
Meselson and Stahl ruled out the dispersive model for DNA replication. -
CORRECTANSWER true
True or false?
DNA replication is a bidirectional process that is initiated at multiple locations among
chromosomes in eukaryotic cells. -CORRECTANSWER True
How many replication forks are formed when an origin of replication is opened? -
CORRECTANSWER 2
How does the total number of replication origins in bacterial cells compare with the
number of origins in human cells? -CORRECTANSWER 1 versus 10,000
