Theoretically, which two of the following present the richest potential sources of silica?
1. marine sediments consisting of foram tests
2. diatomaceous earth
3. marine sediments consisting of radiolarian tests
4. marine sediments consisting of dinoflagellate plates
A) 1 and 2
B) 1 and 4
C) 2 and 3
D) 2 and 4
E) 3 and 4
Ans: C) 2 and 3
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The process of nitrogen fixation involves the transformation of ________.
A. ammonia to nitrate B. ammonia to organic matter nitrogen C. nitrogen gas to ammonia D. nitrate to nitrogen gas
An example of an animal with paired nerve cords that connect to a simple brain is a ____
a. starfish b. jellyfish c. grasshopper
d. sea urchin e. planarian
If a cell contains 95% water in its cytoplasm and the environment surrounding the cell contains 90% water
A. water will flow into the cell by osmosis. B. water will flow out of the cell by active transport. C. water will flow out of the cell by osmosis. D. water will flow into the cell by active transport. E. water will flow into the cell by facilitated diffusion.
Which of the following are macrophage functions?
A) phagocytosis of pathogens and debris B) release of alpha interferon C) production of NETs D) phagocytosis of pathogens and production of NETs E) phagocytosis of pathogens and secretion of alpha interferons and leukotrienes