Chytridiomycetes produce enzymes that digest cellulose, chitin, and similiar molecules. These fungi are contributing to the decline of amphibians world-wide through what mechanism?
A. by infecting their lungs
B. by digesting keratin in the frog's skin
C. by killing their eggs in the water
D. by digesting chitin in the cell wall of the frog's cells
E. by digesting cellulose in the cell wall of the frog's cells
Ans: B. by digesting keratin in the frog's skin
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Which one of the following is the function of horizontal cells in the eye?
A. They transmit signals from rods and cones to the optic nerve. B. They receive signals from multiple photoreceptors (rods and cones), integrating and regulating their input. C. They communicate between and among bipolar cells. D. They process of visual input to actually form an image.
Strobili are:
a. flowers b. spore forming, cone shaped structures with modified leaves c. clusters of spore producing capsules d. accessory leaf-like structures e. stems that grows horizontally, underground
An arachnid parasite causes the skin disease known as (leishmaniasis/ringworm/scabies)
What will be an ideal response?
A drug that decreases the flow of potassium through the potassium gates of the membrane would:
A. block action potentials B. increase the threshold of the membrane C. slow the return of the membrane to its resting potential D. cause the membrane to be hyperpolarized