Download Genetic Material The Hershey-Chase experiment was designed to

Bio07_TR__U04_CH12.QXD
5/3/06
3:44 PM
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Name______________________________
Class __________________
Date ______________
Genetic Material
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
inject their genetic material into bacteria.
Label the DNA with radioactive label, and the DNA without
radioactive label.
DNA with
radioactive label
Protein coat with
radioactive label
Phage infects bacteria
Phage infects bacteria
Use the diagram to answer the question. Circle the best answer.
1. What did Hershey and Chase conclude was the genetic
material of the virus?
DNA
protein
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Bio07_TR__U04_CH12.QXD
5/3/06
3:44 PM
Page 56
Name______________________________
Class __________________
Date ______________
Base Pairing
Four nucleotides make up DNA: adenine, cytosine, guanine, and
thymine. These nucleotides always occur in pairs called base pairs.
Write the missing letter to complete each base pair. The first two have
been done for you.
C
G
A
T
G
G
C
C
Key
A = Adenine
C = Cytosine
G = Guanine
T = Thymine
T
A
C
Use the diagram to answer the questions.
1. What nucleotide is always paired with thymine?
2. What nucleotide is always paired with guanine?
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