Which statement best describes the definition of the term amphoteric? 1.Amino acids are soluble in water. 2. Amino acids exists as a zwitterion in the solid state. 3.Amino acids possess both polar and nonpolar functional groups. 4.Amino acids possess both acidic and basic functional groups.

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The collaboration between the cells and proteins that work together as a defense system against infection comprises the immune system.Each of them performs a variety of tasks to recognize and/or react against a foreign body.