Why does the cell surface membrane not provide a barrier to the entry of hydrophobic molecules into the cell?

Cell membranes are essentially lipid-based so they're hydrophobic. Therefore, most hydrophobic molecules can pass through the cell membrane

Explanation:

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characterization of nanoparticles is a critical step in nanomaterial production as it provides information of dimension, morphology, surface charge, distribution and degree of surface functionalization.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?