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.