If cancer cells invade the muscles under the breast tissue a patient will most likely need to undergo ________
a. a mastectomy
b. isotope tracing
c. radiation
d. chemotherapy
e. None of these choices.
a
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You recently discovered a new element, and find that this particular element has one electron its outer energy level. What would you expect will happen to an atom of this element if placed in water?
A. It will gain an electron forming a positive ion. B. It will lose an electron forming a negative ion. C. It will lose an electron forming a positive ion. D. It will gain an electron forming a negative ion.
Histone modification:
A. is fixed; once a histone is modified, it stays that way and the genes with which it is associated are turned on or off permanently. B. is fixed, but this has no effect on whether genes are expressed. C. is randomâ€"sometimes the lysines are modified and sometimes they're not, but the state is independent of the environment or cell type. D. can change over time in response to environmental cues, allowing genes to be turned on or off as needed. E. can change over time in response to environmental cues, but this has no effect on gene expression.
According to the competitive exclusion principle, the populations of two species that live in the same place and have exactly the same ecological requirements
A) can coexist at the same carrying capacity (K) as when each population is separate. B) can coexist but with the population of each species at half of the carrying capacity (K) as when each population is separate. C) can coexist but with the population of one species much higher than that of the other species. D) cannot coexist because one species will eventually drive the other to extinction.
Describe the two forces that drive an ion across the plasma membrane and explain how the Nernst equation takes into account both of these forces
Use the components of the equation to support your explanation and be sure to specify the assumptions being made when using the Nernst equation to calculate membrane potential.