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A selectively-permeable biological membrane that separates the interior of all cells from the outside environment.

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Why are sugars like mannose expressed on the outside of eukaryotic cell membranes?

Bacteria are able to adhere to sugars (e.g. mannose) on the exterior of eukaryotic cells, leading to infection and disease. Why have eukaryotes not evolved so as to dispense with sugars on their cell …
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