Your teacher ask you to write a summary from the quizzes below (about 75 words). Use the Questions and Answers to help you. BIOLOGY CLASS QUIZ 1 Which of the following describes how phospholipid regions are positioned in the cell membrane? A. Hydrophilic phosphate regions are positioned toward aqueous environments. Explanation: Environments on either side of the cell membrane are aqueous. So, the hydrophilic phosphate regions are positioned toward these environments since they readily associate with water. BIOLOGY CLASS QUIZ 2 Which of the following best describes how high levels of cholesterol affect the cell membrane at certain temperatures? D. At high temperatures, high amounts of cholesterol decrease the fluidity of the cell membrane. Explanation: When temperatures are high, the fluidity of the cell membrane may increase to a point that makes it nonfunctional. Cholesterol prevents this by decreasing the movement of phospholipids, which decreases the fluidity of the cell membrane. BIOLOGY CLASS QUIZ 3 “An embedded membrane protein spans the entire cell membrane of a single cell.” Which of the following must be true about the amino acids that make up the protein? B. Amino acids with charged side groups are in contact with the phosphate region of the cell membrane. Explanation: Amino acids with charged side groups are hydrophilic. These hydrophilic amino acids associate with the hydrophilic phosphate region of the cell membrane.