A particular virus that infects E. coli does so by integrating its DNA into the bacterial DNA. How well this integration goes depends on the topology of the E. coli ‘s DNA. If the superhelical density (σ) of the E. coli DNA is greater than −0.045, the probability of integration is less than 20%. However, when σ is less than −0.06, this probability is >70%. Show your work.   The bacterial DNA isolated from an E. coli culture is found to have a length of 13,800 bp and an Lk of 1,222. a) Explain why σ is typically a negative number in cells. b) Calculate σ for this bacterial DNA. Show your work. c) Predict the likelihood that the virus will be able to integrate its DNA into the E. coli genome. 

Why do histones contain a high percentage of basic residues?  

When is a person likely to induce anabolism?

The DNA gene sequence for protein X is shown schematically below.  Based upon this, which of the sequences listed below would yield the correct, mature RNA transcript for this particular protein?   Exon=Blue while Intron=Gray  

A popular roller coaster ride lasts 10 minutes. There are 20 people on average on the roller coaster during peak time. How many people are stepping onto the roller coaster per minute at peak time?

Serum ________ is/are monitored frequently in those with chronic kidney disease.

Which of the following is very prevalent in people with chronic kidney disease?

When is a person likely to induce anabolism?

Iodinated contrast is used when there is:                

What is the relationship of central obesity to health?