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Genomic DNA from the nematode worm Caenorhabditis elegans is organized by nucleosomes in the manner typical of eukaryotic genomes, with 145 bp encircling each nucleosome and approximately 55 bp in linker DNA. When C. elegans chromatin is carefully isolated, stripped of non-histone proteins, and placed in an appropriate buffer, the chromatin decondenses. Suppose researchers mix a sample of this chromatin with a large amount of DNase I that randomly cleaves DNA in regions that are not protected by bound proteins. Next, they remove the nucleosomes, separate the DNA fragments by gel electrophoresis, and stain the fragments with ethidium bromide.
a. Approximately what range of DNA fragment sizes do you expect to see in the stained electrophoresis gel? How many bands will be visible on the gel?
b. Explain the origin of DNA fragments seen in the gel.
At a situation, the investigators found a bullet lodged into the window frame above the woman’s desk.What kinds of equipment are forensic scientists most likely to use when analyzing the bullet?
In wild pigs, the allele for black fur is dominant over the allele for brown fur. A black wild pig is crossed with a brown wild pig, producing five F1 black wild pigs and six F1 brown wild pigs.
find the amount of energy a mammal.
define how the axonal membrane potential is restored. Describe how resting ionic distributions are maintained.
Set up a reaction according to the following table. Fill in the amount of each component I would use to set up the reactions, and complete the table:
Compare and contrast, in depth, the cellular processes of mitosis and meiosis. Include interphase in your explanation. Chromosomal movement and status must be included in your answer. You may include a diagram to explain your answer but you should..
Cellulose can provide a widely available and cheap form of glucose, but humans cannot digest it.
List and describe at least three cellular features of bacteria that could be targeted to inhibit or kill bacterial pathogen. Which is a significant flaw in this experimental set-up.
What is an inspiratory capacity (IC) of a person with a tidal volume of 505 ml and an inspiratory reserve volume of 1950 ml? Is this person male or female.
If a population of algae-eaters experiences predation pressure from pike-cichlids which is the least likely to be observed in the algae-eater population over the course of many generations.
The signaling mechanisms used by a steroid-hormone receptor and by an ion channel linked receptor have very few components. Can either mechanism lead to an amplification of the initial signal? If so, how? Ideas are included.describe an amplificati..
Assume you observe a populatin with 4150 zygotes with the genotype AA, 800 zygotes witht he genotypes Aa, and fifty zygotes with the genotype aa.
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