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23 Cards in this Set
- Front
- Back
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double helix
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formed by two stands of nucleotides twisted around each other
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nucleosome
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a subunit of nucleic acid formed from a simple, phosphate group and a nitrogenous base
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DNA helicase
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unwinds in multiple areas as DNA is replicated
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semiconservative replication
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parental stands separate and seve as templates for new stands of DNA
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circular DNA
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the DNA of prokaryotes
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sinlge-stranded bindin proteins
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keep the strands of DNA separate dring replication
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leading strand
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elongates as DNA unwinds and is replicated continuously
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eukaryotic DNA
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unwinds the double helix
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? guanine, cytosine and thymine are the four ? in DNA
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adenine, nitrogenous bases
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in DNA, ? always forms hydrogen bonds with gaunine
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cytosine
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the seqence of ? carries the genetic infomation of an organism
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nucleotides
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Chargaff's data states that the number of ? bases equals the number of pyrimidine bases in DNA
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purine
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The twisted ladder shape of DNA is called a ?
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double helix
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DNA is the ? of all organisms
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genetic material
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the pyrimidine bases have a ? structure
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single-ring
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the purine bases have a ? structure
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double-ring
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DNA and RNA are the two ? found in living cells
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nucleic acids
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DNA supercoils to make up the structure known as a ?
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chromosome
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is the ability of an organism to control which genes are transcribed
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Gene requlation
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a ? contains the genes for the proteins needed for a specific metabolic
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chromosome
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an operator is a segment of DNA that acts as an on/off switch for ?
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transcription
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? can control gene expression using transcription factors
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eukaryotes
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hox genes play an important role in determining the ? of an organism
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genes
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