1
Q
DNA vs. RNA
A
DNA: stores instructions of the genetic code
RNA: transcribes and translates the genetic code to make proteins
2
Q
what did Johann Miescher do in 1868?
A
isolated an organic acid that was rich in phosphorus that he guessed was the genetic material
- called it a nuclein
3
Q
What did Chargaff do in 1949?
A
showed:
- A pairs with T, held together by a double bond
- C pairs with G, held together by a triple bond
4
Q
Chargaff’s rule
A
- the amount of adenine is the same as the amount of thymine
- the amount of cytosine is the same as the amount of guanine
5
Q
the structure of DNA
A
each nucleotide of DNA strand consists of
- deoxyribose sugar
- phosphate group
- nitrogen base (A,T,C,G)
6
Q
what did Rosalind Frank do in 1953)
A
showed DNA had a helix structure through her X-ray crystallography
