Marathon runners can lose a great deal of Na+ through sweat. Some runners compensate by drinking large quantities of water. In extreme cases, this causes mental confusion and loss of muscle coordination. What is happening to the neurons of such a runner?
What will be an ideal response?
Na+ loss and dilution has lowered Na+ concentration outside of neurons, altering the Na+ equilibrium potential
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If there is life on another planet within our galaxy, why would we expect to learn that this life would probably use the same narrow range of wavelengths of the electromagnetic spectrum as we do for a source of energy and information?
a. because all life must use the same electromagnetic spectrum by definition b. because of the fundamental aspects of photon energy and light absorption c. because this is the same wavelength that hits the Earth d. because there is no other wavelength available in nature
Small single strand DNA molecules with a fluorescent molecule attached that are used to identify a clone containing a specific gene fragment is called a
A) primer. B) probe. C) plasmid. D) promoter. E) peptide.
Helper T-cells
A. suppress immune reactions. B. directly destroy target cells. C. activate B-cells and other T-cells. D. secrete antibodies. E. function in allergic reactions.
When cytosolic levels of iron increase, intracellular ferritin levels will
A. drop until iron levels increase further. B. increase. C. decrease. D. fluctuate by increasing and decreasing in a random fashion. E. not change.