Stored energy is called ________ energy.
Fill in the blank(s) with the appropriate word(s).
Answer: potential.
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Acetylcholine receptors can be differentiated by their ability to be activated by substances such as ________ and ________.
Fill in the blank(s) with the appropriate word(s).
One advantage of the three-chambered heart over the two-chambered heart is that ____
a. oxygen-rich and oxygen-poor blood do not mix b. blood pressure is independently controlled in each vascular circuit c. blood flow is faster when there are two circuits instead of one d. capillary beds are possible with a three-chambered heart but not a two-chambered heart e. oxygen-rich and oxygen-poor blood mix
This microscope produces an image of a light cell against a dark background; internal structures are not visible.
A) Compound light microscope B) Phase-contrast microscope C) Darkfield microscope D) Fluorescence microscope E) Electron microscope
All of the following are reasons why an HIV vaccine has not been developed EXCEPT
A) there is no known animal model of natural immunity for HIV infection. B) use of a weakened virus would potentially transmit the infection. C) small, inexpensive animals which could be used for HIV vaccine research are not available. D) vaccines are not effective against viral infections. E) HIV has a high mutation rate so one vaccination would not be effective to treat the world-wide pandemic.