Earth's early atmosphere contained (select all that apply):
A. methane.
B. water.
C. nitrogen.
D. hydrogen.
E. organic molecules.
A, B, C, D
Biology & Microbiology
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Restriction endonucleases are produced by
A. fungi. B. protozoa. C. plants. D. bacteria. E. All of the choices are correct.
Biology & Microbiology
In the correct order from smallest to largest, list the levels of organization present in most animals.
What will be an ideal response?
Biology & Microbiology
Bananas are propagated by ____
a. grafting b. adventitious roots c. tissue culture d. treating banana tissues with colchicine e. planting seeds
Biology & Microbiology
Genes that normally block cell division are called:
a. growth factor genes. b. oncogenes. c. tumor suppressor genes. d. proto-oncogenes. e. growth inhibiting genes.
Biology & Microbiology