What caused the ‘Dust bowl' region in the United States in the 1930s?
a. deforestation
b. acid rain
c. overgrazing on grasslands
d. plowing of grasslands exposed topsoil to wind
e. drought in undisturbed grasslands
d
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What microscope is best to use to view internal features of specimens?
a. basic light microscope b. phase contrast light microscope c. Nomarski process light microscope d. scanning electron microscope e. transmission electron microscope
The body's "thermostat" is located in the ____
a. heart
b. spinal cord c. thalamus d. hypothalamus e. skin
Assuming one mutational event in a gene, on average, which of the following mutagens or mutational conditions would be expected to cause the most damage to a protein synthesized by such a mutagenized gene: 5-bromouracil, 2-amino purine, ethylmethane
sulfonate, or frameshift?
Which of the following describes the role of urinary systems in maintaining cellular homeostasis?
A) Urinary systems filter out diseased and damaged cells that can be excreted from the body. B) Urinary systems regulate water balance, pH, and the concentrations of ions in body fluids for cells. C) Urinary systems ensure the delivery of the proper amount of nitrogen to the cells. D) Urinary systems are important for the generation of urea, which cells can use as an energy source when carbohydrates become scarce.