Discovery and Structure of DNA

What did Friedricch Miescher dicover?

discovered the DNA molecule

what did Oswald avery dicover

DNA transmits genetic information

what did Alfred Hershey and Martha Chase

Discovered that all living organisms contain DNA

WHo dicovered tranformation

Fredric grifith

What did Erwin Chragraff dicover

Base pairing rules

what did Rosaline Franklin do

Xray crystallography to discoverr the double helix of DNA

what did James Watson, Francis Crick, and Wilkins do

Created correct model of the DNA molecule

WHATA RE THE COMPONETS OF DNA

Monomer= nucleotide(3 parts): nitrogen base, deoxyribose sugar, and phosphate group

What parts of DNA are what on the ladder

nitrogen bases are steps and sugars and phosphate groups are deoxuribose are legs

What are the base pairing rules for the steps

Adenine and Thymine, then Guanine and Cytosine

what are purines

adenine and Guanine

what are Pyrimidines

Thymine and CYtosine

WHat is DNA replication

Cells make copy of DNA in the Nucleus to prepare for Cell division

in which direction does DNA replication occure

Always occurs in 5 to 3 direction

Step one of DNA replication

Enzyme Topoisomerase loosens the tight coils of DNA molecule

step 2 of reliplication

Enzyme Helicase unzips the strand of DNA by breaking hydrogen bonds

Step 3

Enzyme RNA primase starts new base pariring by mathing A-Tand C-G

step 4

Enzyme Polymerase makes 2 starnds of 5 to 3 direction and proofs reads strands

step 5

Enzyme DNA Ligase helps to reassemble two new starnds after replication

TEKOMERES

PROTECT CHROMOSEME