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WorksheetsDNA Structure and Replication
Total questions: 20
Worksheet time: 23mins
Name
Class
Date
1.
Adenine bonds with ______________.
a)
Guanine
b)
Thymine
c)
Cytosine
d)
Adenine
2.
Guanine bonds with ______________.
a)
Adenine
b)
Guanine
c)
Cytosine
d)
Thymine
3.
Which 2 molecules form the sides (backbone) of the DNA ladder?
a)
deoxyribose sugar and adenine
b)
deoxyribose sugar and a hydrogen bond
c)
deoxyribose sugar and the nucleus
d)
deoxyribose sugar and phosphate
4.
Nitrogenous bases are joined by which type of bond?
a)
polar bonds
b)
ionic bonds
c)
covalent bonds
d)
hydrogen bonds
5.
The enzyme that unzips the DNA to prepare for replication
a)
helicase
b)
replicase
c)
polymerase
d)
synthase
6.
What are the nucleotides made of?
a)
Sugar, Phosphate, nitrogen base
b)
Phosphate, Adenine, nitrogen base
c)
Thymine, Adenine, Cytomine
d)
Phosphate, Nitrogen, Adenine
7.
Which enzyme fixes the Okazaki fragments in the lagging strand?
a)
Helicase
b)
Polymerase
c)
Ligase
d)
Primerase
8.
If a strand reads:
3' A A A T T T C 5'
The matching DNA strand would read...
a)
5' T T T A A A G 3'
b)
3' T T T A A A G 5'
c)
5' A A A T T T C 3'
d)
3' U U U A A A G 5'
9.
This picture is illustrating the ____ nature of DNA.
a)
anti-parallel
b)
deoxyribosic
c)
helical
d)
radioactive
10.
Polymerase is able to replicate the new DNA ______ along the leading strand.
a)
continuously
b)
only in short fragments
c)
very slowly
d)
prokaryotically
11.
If the percentage of DNA is made of 30% Thymine, what is the correct percentage of Guanine?
a)
30
b)
15
c)
20
d)
60
12.
These are the "smaller", single ringed bases such as thymine and cytosine
a)
complementary
b)
cytosine
c)
purine
d)
pyrimidine
13.
In Chargaff's Rule, adenine pairs with ________, and cytosine pairs with _________ in DNA.
a)
thymine, guanine
b)
guanine, thymine
c)
uracil, guanine
d)
thymine, uracil
14.
What is the sugar in the DNA molecule?
a)
deoxyribose
b)
ribose
c)
glucose
d)
fructose
15.
Which enzyme is responsible for adding nucleotides?
a)
Topoisomerase
b)
DNA Polymerase
c)
Ligase
d)
Primase
16.
Label the parts of the nucleotide
a)
Phosphate
b)Sugar(Dexoyribose)
c)Base
1
2
3
1)
2)
3)
17.
Label the components (parts) of the DNA molecule.
a)Phosphate
b)Deoxyribose sugar
c)Hydrogen bond
d)Base
e)nucleotide
1
2
3
4
5
1)
2)
3)
4)
5)
18.
Why is it so easy for the bases in the middle of the DNA ladder to separate so easily during replication?
a)
the hydrogen bonds are weak
b)
the covalent bonds are strong
c)
the DNA backbone is unstable
d)
the bases are hydrophobic
19.
what nucleotides are purines?
a)
Thymine and cytosine
b)
Adenine and thymine
c)
Uracil and cytosine
d)
Adenine and guanine
20.
The new DNA on the leading strand is synthesized in the _________ direction
a)
5' to 3'
b)
3' to 5'
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