lecture 4 Flashcards
dna structure and properties pt.1
1
Q
what are Chargaff’s rules?
A
- guanine%=cytosine%; adenine%=thymine%
- molecular diversity: the composition of DNA varies from one species to another, in particular, in relative amounts of individual bases
2
Q
Gosling and Wilkons used an x-ray diffraction technique to find what characteristics of DNA?
A
crystalline structure; spiral
3
Q
Watson, Crick, and Franklin found that DNA attracts water. what property of DNA does this show?
A
it is polar, phosphate must be on the outside as that is the only molecule of DNA that would attract water
4
Q
what did image B-51 show?
A
there are ten bases per DNA twist
5
Q
what type of bonds hold together the bases of DNA?
A
hydrogen bonds
