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WorksheetsDNA Structure & Replication
Total questions: 23
Worksheet time: 28mins
Name
Class
Date
1.
A nucleotide is made up of three parts: which of these is not one of those parts?
a)
sugar
b)
phosphate
c)
amino acids
d)
base
2.
A strand of DNA that looks like a twisted ladder is called a _____________________
a)
triple twist
b)
corkscrew
c)
double helix
d)
chain reaction
3.
Adenine, Cytosine, Guanine and Thymine are examples of
a)
DNA structure
b)
DNA bases
c)
DNA double helix
d)
Paired bases
4.
The rules of DNA pairing states that Adenine (A) always pairs up with
a)
Thymine
b)
Cytosine
c)
Adenine
d)
Guanine
5.
The rules of DNA pairing states that Cytosine (C) always pairs up with
a)
Thymine
b)
Cytosine
c)
Adenine
d)
Guanine
6.
What holds the DNA bases together?
a)
Hydrogen bonds
b)
DNA bases
c)
Double Helix
d)
Paired bases
7.
DNA is a polymer made of:
a)
Nucleotides
b)
Ribosomes
c)
Purines
d)
Pyrimidines
8.
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
9.
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
10.
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
11.
Which organelle is DNA usually found in?
a)
cell membrane
b)
vacuole
c)
ribosome
d)
nucleus
12.
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
13.
What will the matching sequence be on a strand that reads AAGCTAT?
a)
AACGATA
b)
TTCGTTA
c)
CCTGATA
d)
TTCGATA
14.
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
15.
If a strand reads:
3' A A A T T T C 5'
The matching strand would read...
3' A A A T T T C 5'
The matching 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'
16.
DNA replication turns one strand of DNA into two new strands of DNA. What percent of each new strand is the old strand?
a)
Half of each new DNA is the old DNA
b)
The old strand of DNA was digested, so none
c)
The new DNA is entirely made up of the old DNA
d)
About every sixth base comes from the old DNA
17.
If a DNA molecule is 18% Guanine which of the following is correct
a)
18% cytosine, 32% adenine, 32% thymine
b)
32% cytosine, 18% adenine, 32% thymine
c)
18% cytosine, 64% adenine, 64% thymine
d)
32% cytosine, 32% adenine, 18% thymine
18.
the process of making a copy of DNA
a)
transcription
b)
double helix
c)
DNA replication
d)
replication fork
19.
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
20.
The enzyme that unwinds the DNA to prepare for replication
a)
helicase
b)
replicase
c)
polymerase
d)
synthase
21.
DNA replication results in
a)
2 completely new DNA molecules
b)
2 DNA molecules that each contain a strand of the original
c)
1 new DNA molecule and 1 old
d)
1 new molecule of DNA
22.
The picture below shows an enzyme unwinding and unzipping DNA.
What is the name of this enzyme?
a)
DNA Helicase
b)
DNA Ligase
c)
DNA polyermase
d)
RNA Polymerase
23.
Which enzyme is responsible for adding the free nucleotides to the replicating DNA?
a)
DNA Helicase
b)
DNA Ligase
c)
DNA polyermase
d)
RNA Polymerase
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