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WorksheetsMolecular biology
Total questions: 15
Worksheet time: 5mins
Name
Class
Date
1.
Eukaryotes differ from prokaryote in mechanism of DNA replication due to ____________
a)
Use of DNA primer rather than RNA primer
b)
Different enzyme for synthesis of lagging and leading strand
c)
Discontinuous rather than semi-discontinuous replication
d)
Unidirectional rather than semi-discontinuous replication
2.
The enzyme that unwinds the DNA to prepare for replication
a)
helicase
b)
replicase
c)
polymerase
d)
synthase
3.
DNA replication results in two DNA molecules,
a)
each one with two original strands
b)
each one with two new strands
c)
each one with one new strand and one original strand
d)
one with two new strands and the other with two original strands
4.
Which enzyme is responsible for adding nucleotides?
a)
Topoisomerase
b)
DNA Polymerase
c)
Ligase
d)
Primase
5.
Based on the diagram, how many origins of replication are represented?
a)
1
b)
2
c)
3
d)
4
6.
Place the following in sequential order
1. Recoil
2. Straightens the double helix
3. Breaks Hydrogen bonds
4. Adds Free nucleotides
1. Recoil
2. Straightens the double helix
3. Breaks Hydrogen bonds
4. Adds Free nucleotides
a)
1, 2, 3, 4
b)
3, 4, 2, 1
c)
3, 2, 4, 1
d)
2, 3, 4, 1
7.
Based on the diagram, the enzyme (represented in gray) is most likely...
a)
DNA polymerase
b)
DNA Ligase
c)
Nuclease
d)
Helicase
8.
Which of the following does DNA polymerase NOT do?
a)
connects nucleotides (in the new strand) through covalent bonds
b)
Matches the template nucleotides with free nucleotides
c)
proofreads
d)
It does all of these functions
9.
After analyzing a sample of DNA, a scientist recorded the data shown in the table. What percentage of the DNA sample is cytosine?
a)
22%
b)
25%
c)
28%
d)
56%
10.
Which enzyme seals okazaki fragments together on the lagging strand?
a)
Topoisomerase
b)
Helicase
c)
Polymerase
d)
Ligase
11.
The separation of the two single strands of DNA creates a ‘Y’ shape?
a)
enzyme
b)
unzip
c)
A replication fork
12.
This enzyme synthesizes short RNA sequences to guide DNA Polymerase
a)
Primers
b)
DNA Primase
c)
DNA Polymerase
d)
Topoisomerase
13.
Which enzyme is responsible for adding nucleotides to the free three prime end
a)
Helicase
b)
Topoisomerase
c)
DNA Polymersase 3
d)
DNA Polymersase 1
14.
Which enzyme proofreads and removes RNA Primase
a)
Ligase
b)
Polymerase 1
c)
Polymerase 3
d)
Helicase
15.
Which enzyme has the job of unzipping the double helix?
a)
Helicase
b)
Polymerase
c)
Ligase
d)
Primerase
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