WorksheetsDNA Structure and Replication
Total questions: 26
Worksheet time: 23mins
Name
Class
Date
1.
Which of the following best describes a DNA molecule?
a)
double helix
b)
contains ribose
c)
made of amino acids
d)
contains Uracil
2.
A nucleotide includes...?
a)
pentose sugar
b)
nitrogenous base
c)
phosphate group
d)
all of the above
3.
In DNA, Adenine bonds with ______________.
a)
Guanine
b)
Thymine
c)
Cytosine
d)
Adenine
4.
Guanine bonds with ______________.
a)
Adenine
b)
Guanine
c)
Cytosine
d)
Thymine
5.
Why is DNA important?
a)
it is very small and very complicated
b)
it's in everything
c)
it serves as the blueprint for making proteins
d)
because we eat it every day for energy
6.
Which 2 molecules forms the sides (backbone) of the DNA ladder?
a)
deoxyribose and adenine
b)
deoxyribose and a hydrogen bond
c)
sugar and the nucleus
d)
deoxyribose (sugar) and phosphate
7.
Which shows the correct complementary base pairing for DNA?
a)
C-A, T-G
b)
A-G, C-T
c)
C-G, U-A
d)
T-A, G-C
8.
What does DNA stand for?
a)
Deoxyribonucleic acid
b)
Denitrogenous acid
c)
Deribonucleic acid
d)
Diribonucleic acid
9.
What is responsible for holding the two strands of the DNA double helix together?
a)
hydrogen bonds
b)
alleles
c)
London dispersion forces
d)
deoxyribose sugars
10.
Name this structure
a)
double helix
b)
nucelotide
c)
twisted ladder
d)
hydrogen bond
11.
Which sequence of DNA bases would pair with this partial strand
ATG TGA CAG
ATG TGA CAG
a)
ATG TGA CAG
b)
TAC ACT GTC
c)
GTA AGT GAC
d)
CAT TCA CTG
12.
How do the leading, and the lagging strands differ?
a)
The leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized in the opposite direction.
b)
The leading strand is synthesized at twice the rate of the lagging strand.
c)
The leading strand is synthesized in short fragments that are ultimately stitched together, whereas the lagging strand is synthesized continuously.
d)
The leading strand is synthesized by adding nucleotides to the 3' end of the growing strand, and the lagging strand is synthesized by adding nucleotides to the 5? end.
13.
Suppose a double-stranded DNA molecule was shown to have 15% adenine bases. What would be the expected percentage of guanine bases in that molecule?
a)
15%
b)
35%
c)
85%
d)
Not enough information
14.
Consider the replication bubble diagrammed at the right. Which letters represent leading strands?
a)
W and X
b)
Y and Z
c)
W and Z
d)
X and Y
15.
Consider the replication bubble diagrammed at the right. Which letters represent leading strands?
a)
A
b)
B
c)
C
d)
D
16.
Which enyzme would be found only on the lagging strand?
a)
DNA polymerase
b)
Primase
c)
Ligase
d)
Topoisomerase
17.
In DNA , the amount of A is equal to the amount of
a)
C
b)
G
c)
T
d)
U
18.
Which enzyme is needed to start DNA replication?
a)
DNA Polymerase
b)
Topoisomerase
c)
Ligase
d)
Primase
19.
Which enzyme is not working correctly if new DNA bases are not added to the template strand?
a)
DNA Polymerase
b)
Topoisomerase
c)
Ligase
d)
Primase
20.
Which enzyme is responsible for proofreading the newly composed DNA strand?
a)
DNA Polymerase
b)
Topoisomerase
c)
Ligase
d)
Primase
21.
Which of the following help(s) to hold the DNA strands apart while they are being replicated?
a)
RNA primase
b)
single–strand binding proteins
c)
DNA polymerase I
d)
DNA ligase
22.
What is meant by the description "antiparallel" regarding the strands that make up DNA?
a)
The twisting nature of DNA creates nonparallel strands.
b)
One strand is positively charged and the other is negatively charged.
c)
The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
d)
Base pairings create unequal spacing between the two DNA strands
23.
What is meant that DNA replication follows a “semi-conservative” model?
a)
After DNA replication, each strand contains one side that is a parental strand and the other side is a daughter strand.
b)
After DNA replication, one completed strand contains only parental DNA while the other contains only daughter DNA.
c)
None of these identify the “semi-conservative” model.
d)
After DNA replication, one completed strand contains a mixture of both parental DNA and daughter DNA dispersed throughout the strand.
24.
Which scientist(s) stated that DNA contains phosphorus while proteins contain sulfur?
a)
Meselson & Stahl
b)
Hershey & Chase
c)
Watson & Crick
d)
Franklin & Watkins
25.
What determines the nucleotide sequence of the newly synthesized strand during DNA replication?
a)
the particular DNA polymerase catalyzing the reaction
b)
the relative amounts of the four nucleoside triphosphates in the cell
c)
the nucleotide sequence of the template strand
d)
the primase used in the reaction e. the arrangement of histones in the sugar phosphate backbone
26.
In DNA replication , DNA is synthesized in the ____________ on both sides.
a)
5' to 3'
b)
2' to 4'
c)
3' to 5'
d)
4' to 2'
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