What percentage of the earth's atmosphere consists of nitrogen (N2) gas?
A. 0%
B. 10%
C. 28%
D. 44%
E. 78%
E. 78%
Biology & Microbiology
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What is the name of the class of enzymes that will recognize a specific sequence of DNA and cut it?
A. DNA polymerases B. topoisomerases C. restriction endonucleases D. helicases E. primases
Biology & Microbiology
The first vertebrates are seen in the fossil record of the:
A. Ediacaran. B. Cambrian. C. Ordovician. D. Devonian. E. Jurrasic.
Biology & Microbiology
What is considered to be the primary method of succession in the marine intertidal zone?
A. facilitation. B. submission. C. logistic growth. D. tolerance. E. inhibition.
Biology & Microbiology
Are all species introductions the fault of humans? What will be an ideal response?
Biology & Microbiology