Which of the following is not important in determining the distribution of organisms in aquatic
biomes?
a. light penetration
b. mineral nutrient concentrations
c. precipitation
d. salinity
e. temperature
C
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Pneumocystis (carinii) jiroveci
A. causes serious infection in the elderly, premature infants, and AIDS patients. B. is an obligate parasite. C. is a bacterium. D. lacks ergosterol in its plasma membrane.
After ten years of hard work and intensive study, you complete your PhD in botany. Your dissertation is celebrated in your field, and your adviser informs you that you can choose any plant in the world to continue your research. Without hesitation, you choose one of the strangest plants on the planet, the Welwitschia! But this rare species, the singular in its genus, can be found in only one place. Where must you travel to research this bizarre and fascinating plant?
a. Siberia b. New Guinea c. Namib d. Tibet
Which mineral is essential to the production of thyroid hormone?
a. iron b. calcium c. sodium d. potassium e. iodine
Why is a reducing atmosphere conducive to the origin of life?
A. It is more favorable for the development of organic molecules. B. It is rich in free oxygen. C. It is very similar to today's atmosphere. D. It is devoid of organic molecules.