WorksheetsDNA Structure Review
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
Which of the following best represents a nitrogen base?
a)
B
b)
A
c)
C
d)
D
e)
E
2.
Which of the following best represents a base pair?
a)
D
b)
A
c)
B
d)
C
e)
E
3.
After examining the DNA of different organisms, which of the following did Chargaff conclude about the four bases?
a)
A = T and C = G
b)
A = C = G = T
c)
A = C and G =T
d)
A + T = C + G
4.
What hold the base pairs together?
a)
magnetism
b)
hydrogen bonds
c)
covalent bonds
d)
Ionic bonds
5.
Which of the following best represents a hydrogen bond?
a)
E
b)
A
c)
B
d)
C
e)
D
6.
In eukaryotic cells, DNA is located in the ____ of the cell?
a)
ribosome
b)
nucleus
c)
cell membrane
d)
golgi apparatus
7.
A nucleotide consists of
a)
a nitrogen base
b)
a nitrogen base and a sugar
c)
a nitrogen base, sugar, and phosphate
d)
two nitrogen bases, a sugar, and a phosphate
8.
Which of the following best represents a nucleotide?
a)
C
b)
A
c)
B
d)
D
e)
E
9.
Watson and Crick are credited with discovering the structure of DNA by combining the work of other scientists with their own. They discovered that the two strands of DNA join together to form a(n)
a)
nucleotide
b)
X in a circle
c)
double helix
d)
covalent bond
10.
DNA is called the blueprint of life because
a)
it contains the instructions for building an organism
b)
it is like a fingerprint
c)
it has a blue color
d)
it can relay messages to other molecules
11.
Which enzyme is responsible for adding nucleotides to a growing DNA strand during replication?
a)
DNA polymerase
b)
Ligase
c)
Helicase
d)
Primase
12.
A DNA strand has the following bases: A A G C C A. What are the bases on its complimentary strand?
a)
A A G C C A
b)
A C C G A A
c)
T T C G G T
d)
C C A T T C
13.
Which of the following best represents a deoxyribose sugar?
a)
A
b)
B
c)
C
d)
D
e)
E
14.
According to Chargaff’s Rule, if the percentage of thymine is 30%, what would the percentage of adenine be in the same DNA strand?
a)
15%
b)
30%
c)
60%
d)
50%
15.
The process that makes an exact copy of a cell’s DNA is called
a)
conservation
b)
transcription
c)
replication
d)
translation
16.
What is the primary function of DNA in cells?
a)
To store genetic information
b)
To protect the cell
c)
To provide energy
d)
To transport nutrients
17.
Which enzyme is responsible for unzipping the DNA double helix during replication?
a)
DNA polymerase
b)
Helicase
c)
Ligase
d)
Primase
18.
In the structure of DNA, what do the letters A, T, C, and G represent?
a)
Nitrogenous bases
b)
Nucleotides
c)
Amino acids
d)
Proteins
19.
Which of the following best represents a phosphate Group?
a)
AB
b)
A
c)
B
d)
C
e)
D
20.
What is the role of DNA polymerase during DNA replication?
a)
To join Okazaki fragments
b)
To unzip the DNA strands
c)
To add RNA primers
d)
To synthesize new DNA strands
100 %
