Biology Chapter 12 Test – Flashcards
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DNA replication results in two DNA molecules:
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Each with one new strand and one original strand.
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Why did Hershey and Chase label the viral DNA with radioactive phosphorus and not radioactive sulfur?
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DNA contains phosphorus and no sulfur
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which of the following is a nucleotide found in DNA?
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deoxyribose and phosphate group and cytosine
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During DNA replication, a DNA strand that has the bases CTAGGT produces a strand with the bases:
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GATCCA
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which part of the bacteriophages in figure 12-1 contains genetic material?
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B
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DNA makes a good molecule for storing information because:
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Its bases can be joined together in any order, like the letters of the alphabet can be strung to form different words.
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which bacteria killed the mice in Griffiths transformation experiment?
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live harmless bacteria and heat killed harmful bacteria
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what stores information in a Cell?
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DNA
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what did rosalind franklin contribute to the effort to identify the structure of DNA?
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X-ray diffraction photos of the DNA molecule
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In both eukaryotes and prokaryotes, how many copies of the chromosomes are left after replication?
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2
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Which of the following include all the others?
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Chromosomes
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What did avery conclude caused transformation?
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DNA was the transforming factor
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In both prokaryotes and eukaryotes, DNA replication happens:
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Before cell division
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What binds to the prokaryotic chromosome to start DNA replication?
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Regulatory proteins
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Which scientist made x-ray diffraction photos of DNA?
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Rosalind Franklin
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Because of base-pairing in DNA, the percent of:
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Thymine molecules in DNA is about equal to the percent of adenine molecules
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Which forms a base pair with thymine?
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Adenine
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In eukaryotes, DNA:
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Is located in the nucleus
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Griffith called the process he observed transformation because:
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Harmless bacteria had been transformed
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Which scientist figured out that the shape of a DNA molecule is a double helix?
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Watson and Crick
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Which o the following statements correctly describes Chargaff's contribution to the study of DNA?
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Chargaff showed that adenine + thymine were found in equal percentages in DNA, but he did not know it was because of base pairing
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What do bacteriophages infect?
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Bacteria
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In what way is DNA like a book?
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DNA has stored info, that can be copied and passed from one organism to the other
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Griffith's experiments advanced the study of genetics by proving that:
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There is a chemical that contains genetic information that can be passed from one organism to the other
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If adenine has 30%, guanine will have ___%.
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20
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A prokaryotic cell replicates its ________ before it splits to form new cells, so that each new cell can have genetic material.
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Dna (or chromosomes)
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Explain how bacteria in Griffith's experiment were transformed.
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The harmless bacteria took in dna from the heat killed bacteria.
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When is DNAs role in transmitting info most important and why?
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When the reproductive cells lose information, it means that the offspring will have a loss of information too
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What is bacteriophage?
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A virus that infects and kills bacteria
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Identify 3 main components on the nucleotides. With a, and t
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Adenine, thymine, and phosphate
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What do a, c, t, and g stand for?
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Adenine, cytosine, thymine and guanine
