Which process represents a step in the nitrogen cycle?
A) Nitrogen-fixing bacteria convert atmospheric nitrogen to nitrates.
B) Nitrites bind to soil particles.
C) Nitrogen-fixing bacteria convert atmospheric nitrogen to ammonia.
D) Denitrifiers convert ammonium to atmospheric nitrogen.
Ans: C) Nitrogen-fixing bacteria convert atmospheric nitrogen to ammonia.
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Bryophytes possess lignin in their xylem
A. true B. false
What is the correct rank order for relative amount of water (most to least) required for excretion of the primary nitrogenous wastes generated by different animals?
A. ammonia ? uric acid ? urea B. ammonia ? urea ? uric acid C. uric acid ? ammonia ? urea D. urea ? ammonia ? uric acid E. urea ? uric acid ? ammonia
Within the ocean, temperature gradients occur in the water column. Which best describes how temperature variations affect the nutrient levels at the surface?
A) Nutrients are decreased near the surface because upwellings force nutrient-rich water towards the warmer bottom and nutrient-poor water to the colder surface. B) There are always many more nutrients at the warmer surface than in the colder deeper water. C) The nutrient level at the surface is not affected by temperature variations. D) Nutrient levels at the surface increase because upwellings force nutrient-rich water from the colder bottom to the warmer surface.
List and describe some of the major areas of biotechnology.
What will be an ideal response?