Cell Biology: What Makes Molecules Hydrophobic & Hydrophilic?

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SUMMARY

The discussion centers on the chemical properties that determine whether a molecule is hydrophobic or hydrophilic, particularly in the context of cell biology and the plasma membrane of animal cells. It is established that molecules with significant dipole moments exhibit polar characteristics, allowing them to engage in dipole-dipole interactions with water, thus classifying them as hydrophilic. Conversely, lipids and certain proteins are identified as hydrophobic due to their nonpolar nature, which prevents interaction with water. Understanding these properties is crucial for comprehending cellular structures and functions.

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  • Basic knowledge of molecular polarity
  • Understanding of dipole-dipole interactions
  • Familiarity with lipid and protein structures
  • Foundational concepts in cell biology
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  • Study the properties of polar and nonpolar molecules
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uio
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Hi

I'm currently studying cell biology, and I'm reading about the hydrophobic parts of the plasma membrane of the animal cell. But I'm wondering, what exactly makes a molecule hydrophilic or hydrophobic? What is the chemistry behind it, and how can I tell which molecules are which? I know that lipids and certain proteins are hydrophobic, but I can't understand why.

Thanks.
 
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When a molecule (or a part of a long molecule) is polar (i.e., it has a significant dipole moment), it can attract a water molecule through a dipole-dipole interaction. That is usually what makes it hydrophilic.
 

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