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Suppose we use X-ray crystallography to determine the three dimensional structures of leucine and histidine at pH 8. This technique enables the determination of the positions of all the C, N, and O atoms in these two amino acids, but the hydrogen positions cannot be directly visualized with this technique. For which of the hydrogen atoms in these two structures will it be possible to infer the hydrogen positions, so that it is unnecessary to measure them?
explain why the internal solute concentration should be different from their marine plant cells.
Explain the sequence of events that underlie an action potential. Be sure to include all relevant ion channels, and the activity of each one during each of the major phases of the action potential.
Suppose you are working for environmental contractor. As part of your job, you are member of group that is assigned the task of identifying a technique for rapidly breaking down.
What previously unanticipated planet-wide feature of Titan might explain the surprising Cassini finding that its surface is not in exactly synchronous rotation with its orbit around Saturn?
The patient offers the subjective symptoms of paresthesias and pain in the lateral three and one-half digits of her right hand.
Aspirin has a pH of three. Some people who take large amounts of aspirin (for example, for arthritis) take a pill that combines aspirin with Maalox. What is the reason for this combination.
Describe the procedure called southern blotting in which probes are used to find which DNA band from a gel contains a particular gene of interest.
White eyes can be due to the combination of two mutations which eliminate both pigment types normally found in the Drosophila eye. assume that your flies have the two which are autosomal, recessive, and not linked.
Suppose that P is always completely dominant to any number of p's, and that the locus is close to the centromere. What is an expected ratio of purple:white in the progeny of the next crosses.
Why would the relationship between a predator like a wolf and a plant like clover be considered neutral? Could these organisms be indirectly related, and if so, how?
It is said that a teaspoon full of neutron star material is so dense that it would burrow directly to the center of the earth. Assume this is valid (it is, actually). Why would the material stop at the center of the earth?
explain How will the net charge of a typical protein change.The table below indicates approximate values for these at 25C. For reference, the delta H(ionization) for Tris is 47kJ/mole.
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