why are micro organisms so small
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Answer:
The smaller they are the more stable and energy efficient(energy conservation) they become, they are able to transport their metabolites inside or outside the cell with lesser energy expenditure.
The size of microbes can be hard to imagine because they are so small. In comparison to animal cells, microbes tend to be smaller. They are about 1/10th the size of a typical human cell. Microbes are generally measured in the scale of one millionth of a meter, which is known as a micrometer.
Because the environment is nutrient limited, oligotrophic bacteria do not need to grow rapidly and therefore do not need to produce large numbers of ribosomes and enzymes. Thus, small organisms that have a high SA/V and few ribosomes and enzymes have a selective advantage in such environments.
Mycoplasma genitalium, a parasitic bacterium which lives in the primate bladder, waste disposal organs, genital, and respiratory tracts, is thought to be the smallest known organism capable of independent growth and reproduction.
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