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During the early life of an individual, the cells are undifferentiated, and cell division proceeds at a relatively rapid rate. These early cells, called stem cells, can give rise to lots of different kinds of cells, depending on their location in the embryo, and the chemical influences of their surroundings. As you might know, there is a current controversy over whether or not scientists should be allowed to culture and use stem cells from aborted embryos, or even from embryos originally created by in vitro fertilization in the laboratory, to study how this process of differentiation proceeds. Scientists maintain that this research may lead to cures for such diseases as Parkinson's disease, and even Alzheimer's disease. Many individuals, including President Bush, oppose the use of these embryonic cells as immoral. Here is a case where pure scientific research butts heads with certain members of society. Where do you stand? Should this kind of research be allowed? If so, what kinds of limits should be placed on these laboratories?
Suppose you have a light chain genome with 64V regions and 8J regions. If you had repeated attempts at recombination, how many dissimilar attempts would be made when the middle region of both V and J is the segment chosen at each recombination.
What is left-sided and right-sided heart failure? Which of these symptoms reflect left-sided heart failure and which reflect right-sided heart failure? Why with reasons.
assume that the Nernst potential (across a neurons plasma membrane) for Mg(2+) is a 100+ mv. Calculate the fold concentration gradient for magnesium and explain in which direction it lies across the membrane (more on the inside or outside of the c..
If the D-value for a certain food product at 70 degrees centigrade is 3 minutes, how long would you need to expose the food to that temperature to conform to the standard practice used in the food industry?
You want 1 L of 100 mu M NaCl, and you have 1 M stock solution. How much of the stock solution and determine how much dH2O will you measure out for this dilution?
No amino acid molecule by itself can speed up or catalyze reactions between other molecules;however, when amino acids are joined together to make a protein with catalytic properties, the new structure (enzymatic protein) can speed up the rat of a ..
Use chi-square test, test whether these two loci show independent assortment? How would you explain the frequency of the progeny genotypes?
what would be the f2 phenotypes and frequencies?
The endocrime and nervous system are main regulating systems of the body. However, the nervous system has been compared to an airmail delivery system, and endocrime system to the pony express. In brief explain this comparison.
Find a transverse section of the human body that was imaged using computerize tomography or magnetic resonance imaging (MRI), and indicate anatomical planes,
You put a cuvette into a spectrophotometer and obtain an absorbance reading of 2.4. How much light is actually reaching the detector?
Discuss the events that take place with glucose levels and insulin secretion both after and meal and during exercise. Why might low blood sugar levels occur?
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