In the Proterozoic eon, accumulated in the atmosphere that supported the first eukaryotes and multicellular organisms.
A. oxygen
B. sulfur
C. nitrogen
D. hydrogen
E. carbon dioxide
A. oxygen
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Nitrifiers are chemolithoautotrophs that use either ________ or ________ as electron donors in a process called nitrification.
Fill in the blank(s) with the appropriate word(s).
During an infection, white blood cells travel to the infected site and phagocytize the pathogens. After phagocytosis,
primary lysosomes fuse with the phagocytic vesicle to form a larger vesicle called a secondary lysosome. The purpose for this process is to: a. Both B and D. b. degrade the bacteria and export it from the cell. c. wrap the pathogen in additional membrane, rendering them harmless. d. mix the pathogens with strong hydrolytic enzymes and destroy them. e. coat the bacteria in lipids derived from the Golgi complex, which cover and smother them.
Endocytosis and exocytosis are means of transport used by
A) bacteria. B) eukaryotes. C) archaea. D) all prokaryotes. E) nothing; no cells use both processes.
Type I diabetes is a(n)
A. autoimmune disease. B. immunodeficiency disease. C. immune complex-mediated hypersensitivity disorder. D. delayed hypersensitivity disorder. E. immediate hypersensitivity disorder.