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14 Cards in this Set
- Front
- Back
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DNA is a ____ composed of ____ called ____.
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polymer; monomers; nucleotides
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Each nucleotide contains...
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phosphate group, pentose sugar, and a nitrogenous base
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What are the four nitrogenous bases?
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thymine, cytosine, adenine, guanine
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Which of the nitrogenous bases are purines and pyrimidines?
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T and C are pyrimidines and A and G are purines
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Cells double their DNA before...
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mitosis
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During mitosis, doubled DNA is...
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equally divided into the daughter cells
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Diploid cells have ___ times the amount of DNA as haploid cells, but haploid and diploid cells have the same amount of ____
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2; protien
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What is the width of the helix in DNA? A full turn on the helix happens every... and there are ____ nigtrogenous bases within every turn of the helix
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2 nm; 3.4 nm; 10
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Which of the nitrogenous bases always pair together?
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A&T; C&G
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DNA is antiparrallel...what does this mean?
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One strand is 5' to 3' and the one attached is 3' to 5'
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in DNA replication, free ____ line up singly along the template in accordance with the ____ rules; the ____ link together
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nucleotides; base-pairing; nucleotides
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each new DNA has one ____ and one ____ strand
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old; new
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List/explain the 3 possible models of DNA replication:
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1. CONSERVATIVE: the parent molecule is intact and the new molecule is made entirely of new nucleotides
2. SEMICONSERVATIVE: template model; both old and new DNA molecules have one old and one new strand 3. DISPERSIVE: old and new DNA molecules are mixtures on cell strands |
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Which DNA replication model was correct?
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semiconservative
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