posted by Yoo .
Supercoiling of DNA can occur (choose all that apply):
A. when double stranded DNA is overwound
B. when double stranded DNA is underwound
C. when double stranded DNA is heated above it's Tm
D. when DNA is treated with nucleases
Generally, cellular DNA is:
A. Slightly underwound
B. Slightly overwound
C. Chemically unstable in basic solutions
i don't think it is C...I am thinking A or D
For the first part of your post, please refer to your later post, which I saw first.
For the second, you might try here: