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The molar extinction coefficient of reduced triphosphopyridine at 340 nm is 6220. Three ml of solution containing 0.2 umoles of TPNH were placed in a cuvette of 1.05 cm light path. Calculate the percentage light transmission of this sample at 340 nm.
The altered tRNA translates the UGA as tryptophan. What nucleotide varies has probably occurred in the mutant tRNA molecule? What consequences will the presence of such a mutant tRNA have for the translation of the normal genes in this cell.
A 20-year old man presents with pain and swelling about the left knee for the past month. He thought that this condition resulted from an old football injury and that it would resolve without incedent. The pain however has persisted and is severe ..
An enzyme catalyzes a reaction at a velocity of 20 umol/min when the concentration of substrate (S) is 0.01 M. The Km for this substrate is 1 x 10-5 M. Assuming that Michaelis-Menten kinetics are followed,what would be the reaction velocity?
A patient lost a lot of blood during surgery and his blood pressure dropped from 120/80 to 90/50. Describe how the kidneys respond to this change in blood pressure.
In examining a picture of the cell taken with an electron microscope, a student observes that the cell has a nucleus and a cell membrane but not a cell wall. The student can accurately conclude that the cell is a what.
The least amount of carbon dioxide from burning of fossil fuels. Toms father suffers a stroke that leaves him partially paralyzed on his right side. What type of glial cell would you expect to find in increased numbers in the area of the brain that i..
Mitochondria are the only organelles that contain their own DNA (circular) and have a double membrane. Why do you think this might be so?
Keeping blood pressure constant, if a vessel dilated to twice its original diameter, what would be the effect on blood flow
Why is the immune system so highly conserved, as other physiological systems are more specially adapted to our mammalian ancestry or hominid roots.
he pyrimidine and purine bases are nitrogen containing compounds. What is the source of nitrogen for these two ring systems? In most examples,
In humans, there are three alleles for blood type: A, B, and O. A and B are codominant over O. Suppose Jim, a man with type A blood, and Leah, a woman with type B blood, have a child, Winnie.
Apoptosis and the Hayflick limit and their relationship to cancer formation
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