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A particular cell type has an average of 2000 receptors of a specific type. You have a culture of these cells, which you expose to the specific ligand for the receptor in question. After an hour, you analyze the cells in culture and you find that the average number of receptors is now 1,200. What do you think happened to explain the decrease in the average number of receptors? Why would this occur?
The Kirb-Bauer Disk Diffusion Technique was performed on 2 different Mueller-Hinton Agar plates. One plate had Escherichia Coli spread on it and the other plate has Staphylococcus Epidermidis spread on it.
The Meselson-Stahl experiments were groundbreaking studies in molecular biology. Some of the clarity of the centrifugation results was due to the that the DNA was fragmented during handling (although the experimenters did not know it at the time).
one of the basic tenets of evolution by natural selection is that evolution requires variation upon which selection acts. How might drift prevent selection from acting?
On your break, you prepare orange juice from frozen concentrate that you purchased at the store. Given the directions, you mix the concentrate with three cans of cold water.
Some evolutionary biologists have argued that the neutral theory should be taken as the null hypothesis to explain genetic variation within species or populations and genetic differences among them.
Design an experiment or series of experiments to support or refute this hypothesis: A diet that is high in salt is associated with hypertension (high blood pressure), but hypertension is more common in people with a family history of the condition..
Rotifer females will often produce clones of themselves when environmental conditions are good. Which of the following best describes this reproductive strategy.
For a particular trait, an organism has the genotype Dd. Based on this information you can be certain that:
What factors contribute to membrane fluidity? List each and discuss the impact on fluidity of altering conditions on that factor in the membrane.
By this time, 35 cells of V. vulnificus have gotten into your blood. However, the doxycycline does slow the growth of the bacteria considerably to a generation time of twelve hours.
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 ..
What will happen to the age structure of the population? What about birthrates?
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