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DNA Structure and Replication

Total questions: 25

Worksheet time: 22mins

Name
Class
Date
1.
Which sequence of DNA bases would pair with this partial strand
ATG TGA CAG
a)
ATG TGA CAG
b)
TAC ACT GTC
c)
GTA AGT GAC
d)
CAT TCA CTG
2.
Which of the following best describes a DNA molecule?
a)
double helix
b)
contains ribose
c)
made of amino acids
d)
contains Uracil
3.
Which of the following units are repeatedly joined together to form a strand of DNA?
a)
amino acids
b)
nucleotides
c)
fatty acids
d)
polysaccharides
4.
In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of
a)
cytosine
b)
guanine
c)
thymine
d)
uracil
5.
Guanine bonds with ______________.
a)
Adenine
b)
Guanine
c)
Cytosine
d)
Thymine
6.
Why is DNA important?
a)
it is very small and very complicated
b)
it's in everything
c)
it serves as the blueprint for traits of all living things
d)
because we eat it every day for energy
7.
What determines the code, or information, of a DNA molecule?
a)
the shape (structure) of the nitrogen bases
b)
the order (sequence) of the nitrogen bases
c)
the color of the nitrogen bases
d)
the frequency (number) of nitrogen bases
8.
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
9.
Nitrogenous bases are joined by which type of bond?
a)
polar bonds
b)
ionic bonds
c)
covalent bonds
d)
hydrogen bonds
10.
Replicate the following strand of DNA: 
AATCATGGA
a)
AATCATGGA
b)
TTAGTACCT
c)
UUAGUACCU
d)
GGATAUCUA
11.
The enzyme that unzips the DNA to prepare for replication
a)
helicase
b)
replicase
c)
polymerase
d)
synthase
12.
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
13.
order of replication
a)
3, 2, 1, 4
b)
2, 1, 4, 3
c)
2, 3, 1, 4
d)
3, 4, 1, 2
14.
A process in which DNA has the unique ability to make an exact copy of itself.
a)
Replication
b)
Translation
c)
Transcription
15.
What is the correct complimentary strand for the following DNA?ATCGAG
a)
TACGAG
b)
ATCGAG
c)
TAGCTG
d)
TAGCTC
16.
In what phase of the cell cycle does DNA replication take place?
a)
G1
b)
S
c)
G2
d)
M
17.
What are the three components of a nucleotide?
a)
sugar, hydrogen, nitrogen base
b)
sugar, oxygen, nitrogen base
c)
sugar, phosphate, nitrogen base
d)
sugar, phosphate, protein
18.
What does DNA stand for?
a)
Deoxyribonucleic acid
b)
Denitrogenous acid
c)
Deribonucleic acid
d)
Diribonucleic acid
19.

which of the following enzymes is the principal replication enzyme in E.coli ?

a)

DNA polymerase I

b)

DNA polymerase II

c)

DNA polymerase III

d)

None of these

20.

What do SSB proteins do?

a)

Bind to DNA to keep the strands separated

b)

Unwind the DNA double helix

c)

Attach the old and new stand of DNA to each other

d)

Adds DNA bases to the new molecule

21.

Where does DNA replication begin?

a)

At the 5' end of the molecule

b)

At the 3' end of the molecule

c)

At the "point of origin"

d)

At the centromere

22.

Which enzyme "glues" DNA fragments together?

a)

Helicase

b)

DNA polymerase

c)

Primase

d)

Ligase

23.

Which enzyme makes the primer so that replication can begin?

a)

Helicase

b)

DNA polymerase

c)

Primase

d)

Ligase

24.

Which enzyme also has proofreading ability

a)

Helicase

b)

Ligase

c)

Nuclease

d)

Primase

25.

Which sequence of DNA bases would pair with this partial strand

ATT GGA GAG

a)

ATG TGA CAG

b)

ATT ACT GTC

c)

TAA CCT CAC

d)

TAA CCA CAG

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