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What is DNA?
Made of nucleotides
2 strands
Bases= adenine,thymine
Guanine,cytosine.
Sugar= Deoxyribose
What is RNA?
Only one strand
Bases= Cytosine,guanine
Adenine,uracil
Sugar= Ribose sugar
What is a polynucleotide?
Mononucleotides joined together
What is DNA semi conservative replication?
DNA helicase spilts hydrogen bonds unzips them to for two single strands
Nucleotides join to complimentary bases by DNA polymerase
Form hydrogen bonds between new and old strand
Two new DNA molecules both containing one old and one new strand
What is Meselson and stahls experiment evidence on semi conservative replication?
Heavy and light nitrogen in separate test tubes
Spun in a centrifuge
Heavy= bottom of test tube
Light= top of the test tube
Heavy bacteria replicated in light nitrogen
Spun again
Settled in the middle showing it had one of each strand
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