Florida Biology EOC Practice Test

Polar molecules are defined by the presence of an end that is slightly positive and an end that is slightly negative. Option B is incorrect because it describes nonpolar molecules, which have an equal distribution of electrical charge. Option C is also incorrect because polar molecules by definition have electrical polarity. Option D is incorrect because polar molecules may also have negative charges, while option D states the presence of only positive charges. Overall, only option A correctly describes the defining characteristic of polar molecules.