1.) Which of the following is not true of negatively supercoiled DNA? A. Eases the separation of nucleotide strands during replication and transcription.

B. Allows DNA to be packed into small spaces.

C. Has less than 10 bp per turn of its helix.

D. Is more negatively charged due to additional phosphates per turn of the helix.

E. Is found in most cells.

2.)How many complete rotations would most likely correspond to a positively supercoiled DNA molecule that is 100 bp in length?

A.) 0

B.) 5

C.) 10

D.) 15

E.) 100

1.

C. Has less than 10 bp per turn of its helix.

2.

D.) 15

Explanation:

Negatively supercoiled DNA

(deoxyribonucliec acid) is the twisting against the helical conformation which is a twist in a left handed direction that loose and straightens the helix at low twisting stress, and knot the DNA into negative supercoils at high twisting stress.

Supercoiling will occur where the DNA helix must uncoiled for the function of a macromolecular assembly.

Supercoiling allows DNA to be packed into small spaces, It allows for more negative charge and can be found in many cells. But it does not have less than 10 bp per turn of its helix.

15 rotations will correspond positively supercoiled dna molecule of 100base pair.

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