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your hair is composedof protein known as keratins that have an alpha helix- like fibrous structure. the alpha helix-structure has approximately 3.6 amion acids per turn of of the helix and a linear dimension of 0.54nm per turn of the helix. for simplicity, let's imagine that a strand of hair is composed of a single keratin molecule in this alpha helix-like state. if you were to grow 25mm(~1inch) in one year, how many turns of alpha helix must be added to the keratin molecule each minute of the year?
Assume your patient is receiving NPH insulin in the morning and evening The 5 p.m. insulin check is high and is to be treated with regular insulin.
Consumption of alcohol (ethanol), especially after periods of strenuous activity or after not eating for several hours, results in a deficiency of glucose in the blood, leading to hypoglycemia. The first step in the metabolism of ethanol by the li..
What are the characteristics of life? There are some things, like planets, stars, viruses and prions that have many of the characteristics of life, but are not alive.
If a transcription factor causes DNA to bend, altering its structure by initiating a loop-like conformation, does this affect its electrophoretic mobility on a gel? If so, would the DNA:protein complex migrate at a slow rate?
Fertilization involves much more than a mere restoration of the diploid chromosome number. What does the process of fertilization entail on the part of both the egg and sperm? What are the effects of fertilization.
Pneumonia is diagnosed by a presence of fluid (dark shadows in an X-ray image) in the alveoli. Given that pneumonia generally is caused by a microorganism, what causes the fluid accumulation? Name a bacterium, a virus, a fungus, a protozoan, and a he..
Compare and contrast protein digestion in the stomach and in the small intestine. Discuss the enzymes and other factors involved as well as hormones regulating these enzymes.
Imagine you have engineered a set of genes, each encoding a protein with a pair of conflicting signal sequences that specify different compartments. If the genes were expressed in a cell, predict which signal would win out for the following combin..
Describe why topoisomerases are required in eucaryotic cells even though eucaryotic DNA molecules are linear, not circular like procaryotic DNA molecules.
Distinguish between pathological and trauma. Explain the main pathways by which energy from the sun or from specific chemical reactions enters organisms and passes from organism to organism or back into the environment.
Discuss the evidence that global climate change is anthropogenic. (Provide solid evidence supporting or refuting this idea, and explain your position on the issue.)
Assume you have found a new Xenopus gene that codes for a RNA binding protein. You are not sure what its function is but you are interested in finding out as much as you can.
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