When two atoms are joined together covalently, the van der Waals radius of the atoms in the covalent than the radius of the atoms alone because the joined atoms åre bond are a) longer; repelled due to the shared electron pair O b) shorter; pulled together by hydrogen bonding C) shorter; pulled together by the attraction of the nucleus to the bonded atom d) shorter; pulled together by the shared electron pair e) longer; repelled due to the nuclear repulsion between bonded atoms

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Micelles and Biological Membrane

Micelles are the type of lipid molecules that organize themselves in spherical shape in aqueous solutions. The production of the micelle is a reply to the amphipathic behavior of fatty acids. It means that they consist of both hydrophobic regions and hydrophilic regions. In micelles, polar head groups (hydrophilic groups) produce an outer layer associated with water whereas nonpolar tails (hydrophobic groups) are organized in the interior.