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Consider a circular, B form DNA molecule with a superhelical density of -0.05. Suppose that during replication initiation, a stretch of 84 base pairs unwinds (untwists) without breaking the phosphodiester backbone. What will be the effect on the linking number (Lk) and the writhe (Wr)? (Hint: ‘untwisting' has a negative effect on the twist).
A method for separating polypeptides makes use of their differentail solubilities. The solubility of huge polypeptides in water depends upon the relative polarity of their R groups.
A parallel plate flow chamber is used to measure the viscosity of an unknown fluid. With a channel height of 0.1 cm and width of 1 cm, the wall shear stress can reach 3 Pa with flow rate of 8 cm3/s.
A male green bug from a pure breeding population is crossed to female purple bug from a pure breeding population. All of their hundreds of progeny are purple.
What is the purpose of an uninoculated control tube in a differential test? Should this tube be incubated with the tubes that are inoculated? Why or why not?
Explain the sites and actions of the cardioinhibitory and cardioacceleratory centers and also discuss the factors that affect heart rate and stroke volume.
Assume your TA gives you a bacterial culture and claims there are 4.8 x 107 bacteria/mL in the culture. To check up on her, you prepare serial dilutions of 10-4 - 10-7.
Some malignant tumors remain localized and encapsulated, at least for a time; an illustration is carcinoma in situ in the ovary or breast. Share your thoughts to describe this phenomenon.
The delta G for hydrolysis of the amide group from glutamine is -14.2 kJ/mol at 25C. Compute the keq' for this hydrolysis.
In squash, disc shaped fruit is dependent on dominant gene D and elongated fruit on recessive allele d. Yellow color is controlled by dominant gene R and green color by recessive allele r. Draw a cross between the homozygous squash fruits and summ..
How may this capacity be an advantage to the cell.
Albinism in humans is inherited as a simple recessive trait. For the following families, estimate the gentypes of the parents and offspring.
here Compare and contrast the similarities
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