Name ____________________________________________________ Period ___________ Date ___________________
DNA Review Worksheet
The Hershey-Chase experiment was designed to find out whether DNA or protein carried a virus’s genetic
information. The scientists used radioactive substances to label the DNA in some viruses and the protein
coat in other viruses. Then they let the viruses attack the target bacteria.
1. Label in the diagram the radioactive DNA, and the non-radioactive DNA:
2. What did Hershey and Chase conclude was the genetic material of the virus? (circle one)
DNA
protein
3. ____________________ , guanine (G), cytosine (C), and thymine (T) are the four ____________________
in DNA.
4. In DNA, ____________________ always forms hydrogen bonds with guanine (G).
5. The double-coiled shape of DNA is called a ____________________
____________________.
Use Chargaff’s Rules to predict the bases’ percentage in each of the following DNA situations:
6. 24% Adenine, __________% Thymine
7. 30% Cytosine, __________% Guanine
8. 23% Guanine, __________% Cytosine, __________% Adenine, 27% Thymine
9. __________% Adenine, __________% Cytosine, __________% Thymine, 14% Guanine
DNA Review Crossword
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
ACROSS
1 The name of DNA's sugar.
3 What holds the nitrogen bases together in DNA.
6 The part of DNA that is similar to the sides or
railings of a ladder.
7 Discovered that DNA is the genetic material and
can code for new organisms.
9 Two scientists that discovered the structure of
DNA.
10 The monomers of DNA.
12 The structure of a DNA molecule.
15 The part of DNA's nucleotides that can change.
17 Two nitrogen bases held together by hydrogen
bonds.
18 The smaller category of a nitrogen base, has one
carbon ring.
19 Always pairs with Adenine.
DOWN
1 What the acronym DNA stands for.
2 The larger category of a nitrogen base, has two
carbon rings.
4 Discovered that DNA was the transforming factor
in Griffith's experiment.
5 Took an x-ray crystallographic of DNA which
revealed its structure but received no credit for
helping discover the structure.
8 Always pairs with Guanine.
11 Performed experiments on different species that
tells us the percentages of each nitrogen base in a
sample of DNA.
13 Always pairs with Thymine.
14 Always pairs with Cytosine.
16 Did experiments with mice and pneumonia in the
1920s and discovered something "transformed" one
bacterium into another.