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Bio Ch 12 Test Review
Terms in this set (45)
Which bacteria killed the mice in Griffin's transformation experiment?
live, harmless bacteria and heat-killed, harmful bacteria
Griffith called the process he observed transformation because
the harmless bacteria had been transformed.
What did Avery conclude caused transformation?
DNA was the transforming factor.
What happened when Griffith injected mice with the harmless, R-strain bacteria alone?
The mouse lived.
What would have happened if Avery had added an enzyme that digested all the nucleic acids to the mixture of heat-killed bacteria, added the mixture to harmless bacteria, and injected the mixture into mice?
The harmless bacteria would not have been transformed, and the mice would have lived.
What property of DNA does bacterial transformation illustrate?
Bacterial DNA can move into another bacteria and function.
In Griffith's bacterial transformation experiments,
harmless bacteria change into harmful bacteria.
What is inside a bacteriophage?
What do bacteriophages infect?
Why did Hershey and Chase label the viral DNA with radioactive phosphorous and not radioactive sulfur?
DNA contains phosphorus and no sulfur.
Which part of the bacteriophage contains genetic material?
inside (the protein coat)
What stores information in a cell?
What happens when a piece of DNA is missing?
Genetic information is lost.
In what way is DNA like a book?
DNA has stored information, that can be copied and passed on.
In which cells is the accurate transmission of information most important?
A double helix or spiral ladder describes the structure of
a DNA molecule.
Which of the following is a nucleotide found in DNA?
deoxyribose + phosphate group + cytosine, guanine, adenine or thymine
Because of base pairing in DNA, the percentage of
thymine molecules in DNA is about equal to the percentage of adenine molecules
Based on Chargaff's rule, if the percentage of cytosine bases in bacterial DNA is 13.4%, the percentages of guanine bases in bacterial DNA should be around
Based on Chargaff's rule, the percentage of cytosine in the DNA of the chicken is 20%, the percentage of thymine should be around
What structural problem prevents adenine from pairing with guanine?
The bases are both long.
Which two bases pair together in DNA?
cytosine and guanine or adenine and thymine
Avery's experiments showed that bacteria are transformed by
What did Griffith observe when he injected a mixture of heat-killed, disease-causing bacteria and live harmless bacteria into mice?
The mice developed pneumonia.
What would Hershey and Chase have concluded if both radioactive 32P and 35S were found in the bacteria in their experiment?
Both the virus's protein coat and its DNA were injected into the bacteria.
Avery's experiment worked because bacteriophages and bacteria share which component?
In the Hershey-Chase experiment, what happened to the bacteria that had been infected by viruses that had radioactive DNA, and to the bacteria that had been infected with viruses that had been marked with radioactive proteins?
The bacteria infected with viruses that had radioactive DNA had become radioactive. The bacteria that had been infected with viruses marked with radioactive proteins were not radioactive.
Which scientist made x-ray diffraction photos of DNA?
What is the chronological order of the important discoveries in the structure of DNA?
Chargaff's ratios of nucleotides ® Franklin makes an X-ray diffraction photo of DNA ® Watson and Crick identify the double helix
If a sample contains 22% Adenine and 28% Guanine, how much Thymine should you expect to find in the sample?
What would happen to the percentage of G & C if the percentages of A & T rose?
G & C would drop
Which of the following forms a base pair with thymine?
What did Rosalind Franklin contribute to the effort to identify the structure of DNA?
x-ray diffraction photos of the DNA molecule
Watson and Crick discovered the two strands in DNA
run in opposite directions.
DNA replication results in two DNA molecules,
each with one new strand and one original strand.
During DNA replication, a DNA strand that has the bases CTAGGT produces a strand with the bases
After DNA replication in eukaryotes, the
nucleosomes become more tightly packed.
Which of the following include all the others?
DNA molecule, histones, chromosomes, nucleosomes
In a replicating DNA molecule, what nucleotide is going to be added opposite from thymine?
In a replicating DNA molecule, what is adding base pairs to the strand?
In eukaryotes, DNA
is located in the nucleus.
What would be greater in a eukaryote than in a prokaryote?
The number of replication forks on a strand of DNA.
What binds to the prokaryotic chromosome to start DNA replication?
In both prokaryotes and eukaryotes, how many copies of the chromosome are left after replication?
Eukaryotic cells can have up to how many times more DNA than prokaryotic cells?
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