Examlex
Which of the following compounds cannot cross the blood-brain barrier?
Polar Covalent
A type of chemical bond where a pair of electrons is unequally shared between two atoms, causing a distribution of electrical charge.
Ionic
Relating to ions; typically describes chemical bonds formed between atoms through the transfer of one or more electrons from one atom to another.
Peptide
Short chains of amino acids, typically comprising 2-50 amino acids, which can perform a variety of functions in the body.
Proton Donor
A substance that releases hydrogen ions (H+) in solution, thus behaving as an acid according to the Bronsted-Lowry theory.
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