Bio DNA Part 1
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15 Terms
1
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DNA is composed of…
4 types of nucleotides
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DNA is a long _____ __composed of__ ________ called nucleotides
polymer, monomers
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Each nucleotide as _____ parts
3
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What are the three parts?
Phosphate group, deoxyribose, nitrogen-containing base
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How did Erwin Chargaff change thinking?
By analyzing the DNA in different organisms
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All DNA found in any organism has…
the same 4 bases
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What was different about the 4 bases from organism to organism?
The proportions
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A+____,C+____
t, g
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what is Chargaff’s Rule?
A=T, C=G
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Who developed accurate model of DNA’s 3-dimentional structure?
Watson and Crick
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Who were the first scientists to suggest the DNA had a helical shape?
Rosalind Franklin and Maurice Wilkins
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DNA is a…
Double Helix
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DNA strands are…
complimentary
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Nucleotides always pair in…
the same way
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Covalant bonds connect…
the sugar of one nucleotide to the phosphate of another
Note 
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