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a stretch of DNA 2060 nucleotide-pairs in length is packed into nucleosomes in chromatin. Each nucleosome has 146 base pairsof DNA wrapped around it, and there are 60 base pairs of linker DNA between nucleosomes. How many molecules of Histone H1 will be found associated with this region?
When a sperm cell comes into contact with an egg cell, there is a change in the electrical charge across plasma membrane and various channel proteins close. What are these channels known as.
Why is the attachment of an amino acid to the correct tRNA considered to be such an important step in proteins synthesis?
After phagocytosis of a pathogen, the phagosome becomes very acidic with the pH dropping to between 3.5 and four. However, some of the enzymes are important to kill pathogens only work when the pH is higher than five.
Describe the steps that occur between the time that a nerve impulse is transmitted across a neuromuscular junction to the time that the muscle fiber actually begins to shorten. What is the role of calcium ions in this process?
What is the benefit of a mouse liver cDNA library over a genomic library made from mouse liver. What is a lipid? Explain the different classes of lipids. What is a fatty acid? What makes acid saturated or unsaturated.
Determine how many molecules of methylene blue dye are in a 256-fold dilution of a 0.00025 percent methylene blue dye stock solution?
Which virus caused it? Why was a viral culture completed after the Gram and acid-fast stain results were obtained.
Cyanide binds to complex IV of the electron transport system, preventing the reduction of oxygen to water. Explain the ultimate effects of cyanide on electron transport, oxygen consumption, and ATP production. How can these in turn affect a person.
Compare changes in carbon cycle to that of the nitrogen cycle on human health. Create a conceptual graphical model for how changing the carbon cycle is likely to impact human health.
In guinea pigs, rough coat (R) is dominant over smooth (r).
Identifying modes of thermoregulation.
In a maternity ward, four babies become accidentally mixed up. The ABO blood types of the four babies are known to be O, A, B, and AB. If a mother is type O and the father is type B, what are the potential blood types of their offspring?
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