Humans excrete nitrogenous waste in the form of _______, and most fish excrete nitrogenous waste as _______
a. urea; ammonia
b. urea; uric acid
c. ammonia; urea
d. urea; uric acid
e. uric acid; ammonia
A; Fish and freshwater amphibians excrete nitrogenous wastes as ammonia because they can easily dilute and unload this potentially toxic compound. It costs more energy to manufacture urea, but takes less water to excrete because it is less toxic and can be excreted at a higher concentration. Mammals and sharks excrete nitrogenous wastes as urea. Insects and egg-laying land vertebrates (birds and reptiles) have even stronger pressures to conserve water and excrete nitrogen wastes as uric acid.
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Which one of the following gases was not a component of the simulated atmosphere in the Miller-Urey experiment?
A. hydrogen B. water vapor C. oxygen D. methane E. ammonia
Which of the following big sagebrush plants is the most fit, based only on the information presented?
A. The individual that can survive with 10% less water than the others in its population. B. The individual that produces 5% more distasteful chemicals, making it 2% less likely to be attacked by herbivores than others in its population. C. The individual that produces 3% more offspring each year than others in its population. D. The individual that is the most resistant to disease organisms in the population. E. All of these individuals are equally fit based on the information presented.
Most transpiration occurs through stomata
____________________ Indicate whether the statement is true or false.
Which fungal group includes organisms used for the manufacture of anesthetics, birth control agents, industrial alcohols, meat tenderizers, and yellow food coloring?
A. Zygomycetes B. Ascomycetes C. Basidiomycetes D. Microsporidia E. Glomerulomycetes