Which of the following is correct if the process includes a further - ProProfs Discuss
Topics
Products
Follow Us:

Which of the following is correct if the process includes a further treatment with a type IB topoisomerase that is active at a high salt solution? A plasmid with 4000 BP of closed circular duplex DNA was isolated from E. coli. It has a 300-BP segment of alternating C and G residues. Upon transfer to a high salt solution, this segment undergoes a transition from the B conformation to the Z conformation. Given that B-DNA contains one right-handed turn per 10 base pairs, Z-DNA contains one left-handed turn per 12 base pairs and linking number (L) equals twist (T) plus the writhing number (W).



A. Its linking number is not changed
B. The change in its writhing number is 55
C. Its original linking number is 400
D. The change in its twist is -55
E. All answers are correct

This question is part of molecule Test 4
Asked by ISciA, Last updated: Mar 27, 2020

+ Answer
Request

2 Answers

Macu

I do not understand how the answer is not all of the above, I calculated all of those answers.
 

John Smith

John Smith

Answered Nov 13, 2016

The change in its twist is -55
 

Search for Google images
Select a recommended image
Upload from your computer
Search for Google images
Select a recommended image
Upload from your computer
Search for Google images
Select a recommended image
Upload from your computer

Email Sent
We have sent an email to your address "" with instructions to reset your password.