Some plants obtain nitrogen from symbiotic fungi or bacteria.What was the original source of N for the bacteria?
a. urea in the soil
b. N2 gas
c. carbohydrates in the soil
d. lipids in the soil
e. proteins in the soil
Ans: b. N2 gas
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The major histocompatibility complex is important in a T-cell's ability to:
A. recognize specific parasites. B. recognize specific bacteria. C. recognize specific viruses. D. recognize self from nonself.
Which of the following foods are highest in naturally occurring sugars?
The chemical reactions that cells use to acquire and use energy to live, grow and reproduce are called ____
a. hydrolysis b. condensation c. phosphorylation d. metabolism e. oxidation
Most of the carbon now present in the earth's
atmosphere will eventually end up in what two reservoirs? a. plants and animals b. plants and decomposers c. plants and soil d. plants and oceans e. plants and fossil fuels