Mod1 - DNA and Gene Structure Flashcards
1
Q
What is Chargraff’s Rule?
A
The total number of PURINES in a DNA Molecule is equal to the number of pyrimidines
2
Q
Which is stronger - G-C bonds or A-T bonds?
A
G-C, as there are 3 hydrogen bonds (whereas A-T only forms 2)
3
Q
What unique feature does Z-DNA have?
A
The helix is left-handed, for A and B it is right-handed
4
Q
Compare the major grooves of A, B and Z-DNA
A
A: Narrow-deep
B: Wide-deep
Z: Flat
5
Q
Compare the minor grooves of A, B and Z-DNA
A
A: Wide-shallow
B: Narrow-shallow
Z: Narrow-deep
