AP Biology: Exam Review 2023-24 with 100% correct answers

DNA/Biochemestry Test - correct answer -- 1. The digestive enzyme pepsin works in the acidic environment of the stomach to hydrolyze peptide bonds. On which macromolecules does pepsin act? A. carbohydrate B. protein C. DNA D. lipid - correct answer B. Protein 2. Egg whites consist primarily of water and the protein albumin. When you fry an egg, why does the egg white turn from clear to white? A. The protein becomes dissociated. B. The protein acquires tertiary structure. C. The protein becomes denatured. D. The protein becomes dehydrated - correct answer C. The Protein becomes denatured 3. Margarine is made by hydrogenating vegetable oils so that they take on the consistency of butter. Which of the following is the chemical basis for this change from a liquid to a solid? A. Fats are changed from unsaturated to saturated, allowing them to solidify. B. Fats are changed from saturated to unsaturated, allowing them to solidify. C. Trans-fatty acids are changed from unsaturated to saturated, allowing them to solidify. D. Trans fatty acids are changed from saturated to unsaturated, allowing them to solidify. - correct ans