one strain changes into another DNA was transferred DNA Through many scientists and many studieswe now know DNA is what carries the info from one generation to the next We now know that DNA is a ID: 930184
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Slide1
DNA
Slide2Slide3Griffith
Mm
Transformation
– one strain changes into another (
DNA was transferred)
Slide4DNA
Through many scientists and many studies….we now know DNA is what carries the info from one generation to the next.
We now know that DNA is a
double helix
composed of nucleotide monomers.
Slide5nucleotides
All DNA nucleotides are made of 3 parts:
5 carbon sugar-
deoxyribose
Phosphate groupNitrogen containing base
Slide6Nitrogen base
Are 4 different bases grouped into 2 types:
Purines
– adenine (A) and guanine (G)
Pyrimidine -thymine (T) and cytosine (C)
Slide7Watson and Crick
Discovered DNA consists of 2 strands of nucleotides, twisted around each other=
double helix
Slide8DNA structure
The sides of the ladder are the sugar and phosphates
The rungs are the nitrogen bases bonded together
The bases attach to the sugar (not the phosphate)
Hydrogen bonds between the bases on each side hold the 2 strands together
Slide9j
Slide10Chargaff’s rules
Base pairing
: the nitrogen bases can only bond between specific pairs
Adenine – Thymine A=T
Cytosine – Guanine C=G