AP BIOLOGY EXAM ESSAY (FREE RESPONSE) QUESTIONS General directions: Answers must be in essay form. Labeled diagrams may be used to supplement discussion, but in no case will a diagram alone suffice. It is important that you read each question completely, and answer each section of the question. When giving examples, the first ones you give will be the ones graded. (if two examples are asked for, and you write about 4, make sure the first two are the best ones; they are the only ones counted!) UNIT 1 BIOCHEMISTRY, WATER, ENZYMES #1 (1996) The unique properties of water make life possible on earth. Select three properties of water and a. for each property, identify and define the property and explain it in terms of the physical/chemical nature of water.