The rickettsial parasite Wolbachia pipientis can ________.
A. enhance the lifespan of an infected wasp
B. confer toxicity to the sting of an infected wasp
C. sometimes alter the sex of an infected wasp
D. None of the choices are correct.
Answer: C
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The adrenal hormone, aldosterone, regulates kidney function by
A. increasing the permeability of the collecting duct to salt. B. increasing the permeability of the collecting duct to urea. C. stimulating active reabsorption of sodium, decreasing its excretion. D. triggering a sensation of thirst. E. reducing the blood flow to the kidney.
Nerve impulses coming into the spinal cord enter via ____
a. intervertebral disks b. neuroglia c. the dorsal roots d. Broca's area e. ventral roots
If human white blood cells were extracted from the circulatory system and then placed into an isotonic solution, which one of the following is most likely to occur?
A) Water will rush into the cells, and the cells will swell and eventually burst. B) Because there is more water outside the cell than inside the cell, an equal amount of water will enter the cell and leave the cell. C) There will be no change in the cells because the isotonic environment is in equilibrium with the cells. D) Because a hypertonic environment is highly acidic, these cells will become acidic as well. E) Water will diffuse out of the cells, and they will decrease in cell volume.
The first embryonic stem cells that were discovered to be totipotent were isolated from a
A. blind dog. B. mouse. C. human pancreas. D. sheep.