Bacterial cell membranes do not have cholesterol. The principal function of the cell membrane is to regulate the substances that enter the cell and the substances that move out of the cell. Cholesterol is a fat like substance that is found in all human cells; it is an important constituent of the cell membrane and it enhances the fluidity of the cell. Bacterial have plasma membrane but the membrane do not contain cholesterol.
The order is anaerobic prokaryotes. Unicellular photosynthetic prokaryotes. Unicellular eukaryotes. Multicellular eukaryotes.
During diffusion the molecules move in constant random motion. <span>The </span>net movement<span> of a substance from a region where it has a higher concentration to a region where it has a lower concentration, due to random molecular motion, is called </span>diffusion<span>. Diffusion is a widespread and important process which occurs in both living and non-living systems. </span>
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Climate change caused an increase in sea level, threatening to impair the functions of harbors. Rising sea levels affect China's coastal land. Cities along the coast such as Shanghai, only 3–5 meters above sea level leaves its 18 million residents vulnerable.
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