Foods such as acidic fruits are often spoiled by
A. fungi.
B. protozoans.
C. viruses.
D. bacteria.
A. fungi.
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Eukaryotic cells are believed to have arisen
A) from a symbiotic relationship between primitive nucleated cells and bacterial cells. B) from the fusion of multiple archaeal cells into a larger, more complex cell. C) independently from prokaryotic cells. D) by mutations that lead to changes in plasma membranes, leading to internal membrane-bound organelles. E) independently from prokaryotic cells by mutations that lead to changes in plasma membranes, leading to internal membrane-bound organelles.
If all prokaryotes on Earth suddenly vanished, which of the following would be the most likely and most direct result?
A) Human populations would thrive in the absence of disease. B) Bacteriophage numbers would dramatically increase. C) The recycling of nutrients would be greatly reduced, at least initially. D) There would be no more pathogens on Earth.
The final shape of a protein is very important to its function. When proteins undergo an irreversible change in shape called ________________ they ________________ perform their usual functions.
A) naturation/can B) naturation/cannot C) denaturation/can D) denaturation/cannot E) dehydration reaction/cannot
A microbial community containing very few species has a low species
a. abundance. b. composition. c. evenness. d. richness.