Name Class Date
DNA Chapter 12Pre-Test
Multiple Choice
Write the letter that best answers the question or completes the statement on the line provided.
1. What did Avery conclude caused transformation?
a. DNA was the transforming factor.
b. A protein was the transforming factor.
c. A carbohydrate was the transforming factor.
d. A lipid was the transforming factor.
2. What do bacteriophages infect?
a. mice.c. viruses.
b. humans.d. bacteria.
3. Which part of the bacteriophage in Figure 12–1 contains genetic material?
a. A
b. B
c. C
d. D
5. Because of base pairing in DNA, the percentage of
a. adenine molecules in DNA is about equal to the percentage of guanine molecules.
b. thymine molecules in DNA is about equal to the percentage of adenine molecules
c. adenine molecules in DNA is much greater than the percentage of thymine molecules.
d. cytosine molecules in DNA is much greater than the percentage of guanine molecules.
7. What would Hershey and Chase have concluded if both radioactive 32P and 35S were found in the bacteria in their experiment?
a. The virus’s protein coat was not injected into the bacteria.
b. The virus’s DNA was not injected into the bacteria.
c. Genes are made of protein and carbohydrates.
d. Both the virus’s protein coat and its DNA were injected into the bacteria
9. Which scientist made x-ray diffraction photos of DNA?
a. Franklinc. Watson
b.Chargaffd. Avery
10. DNA replication results in two DNA molecules,
a. each with two new strands.
b. one with two new strands and the other with two original strands.
c. each with one new strand and one original strand.
d. each with two original strands.
12. In Figure 12–2, what is adding base pairs to the strand?
a. histonesc. DNA polymerase
b. nucleosomesd. chromatin
13. In eukaryotes, DNA
a. is located in the nucleus.c. is located in the ribosomes.
b. floats freely in the cytoplasm.d. is circular.
14. What binds to the prokaryotic chromosome to start DNA replication?
a. replication forksc. chromatids
b. regulatory proteinsd. telomeres
15. Why did Hershey and Chase label the viral DNA with radioactive phosphorous and not radioactive sulfur?
a. DNA contains phosphorus and no sulfur.
b. Proteins contain phosphorus and no sulfur.
c. DNA contains sulfur and little phosphorous.
d. Proteins acids contain sulfur and little phosphorous.
Completion
Complete each statement on the line provided.
16.The matching strand to the one in Figure 12–3, reading from the bottom up, would be ______.
17.______are weak bonds that hold the two strands of DNA together, but also allow the DNA to separate and replicate.
19.DNA replication is carried out by a series of ______.
Short Answer
In complete sentences, write the answers to the questions on the linesprovided.
21.Identify the three main components in the nucleotides shown in Figure 12–4.
22.How did Avery build on Griffith’s work?
23.How did Hershey and Chase know that it was the DNA that had infected the bacterial cells in their experiment?
24.During DNA replication, what two processes must occur before the two strands of a DNA molecule can separate?
25.Identify one difference between prokaryotic and eukaryotic DNA replication.
Name Class Date
Essay
Write the answer to each question in the space provided.
31.How did Griffith arrive at the conclusion that a gene from one kind of bacteria transformed another kind of bacteria?
32.How is DNA like a book? Explain your answer.
33. Figure 12–6 shows a short segment of DNA. Explain how the chemical components of a nucleotide give DNA a structure that allows DNA to hold itself together and yet come apart for replication.