If you were told that concentrations of trace elements, above what is required by organisms, generally have no effect on those organisms, what would you say?
a. true
b. false
Answer: b. false
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Worldwide, decay of organic matter is important to the global carbon cycle because it ____ tens of
billions of tons of carbon dioxide each year.
a. removes from the atmosphere b. prevents the planet from losing to space c. returns to the atmosphere d. prevents plants from having access to e. releases to space
Skin is able to prevent most microorganisms from entering the body by
A) producing alkaline secretions. B) having keratin in the uppermost layer. C) production of antibodies. D) the adhesion junction in the skin preventing bacteria from entering. E) releasing macrophages on the skin surface.
Species with individuals that die equally or linearly at all different ages throughout their life span are known as ________-loss species
Fill in the blank(s) with correct word
Palytoxin is incredibly toxic, perhaps the second most dangerous nonpeptide toxin. It targets the sodium-potassium pump, locking it open and forming a channel through which the ions can passively flow. Palytoxin is produced by zoanthid cnidarians (soft coral), and there have been incidents of poisoning from zoanthids within marine aquaria tanks in people's homes. It is also thought to be the source of the legend of the Limu make o hana ("Seaweed of Death from Hana").What is the likely impact of this toxin on action potentials?
A. They will have longer refractory periods. B. They will occur more frequently. C. They will be stronger and more unpredictable. D. Without ion gradients, action potentials are not possible.