18. prokaryote: Prokaryotes are the simplest organisms. Prokaryotes are cells that contain ribosomes, no membrane-bound organelles, cytoplasm, a nucleoid (DNA) that is found in the central part of the cell, which is all encased in a rigid cell wall. Some bacteria also have a flagella used for motility. Yogurt was made by bacteria that converted pasteurized milk into yogurt via fermentation.
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