18 Multiple Answer 2 points Question at position 18 A nutrient is a substance that an organism uses for A nutrient is a substance that an organism uses for growth. metabolism. maintenance. repair of tissues. All of the answer choices are correct. Question at position 19 19 Multiple Answer 2 points Question at position 19 Anabolic reactions tend to Anabolic reactions tend to use energy and degrade food produce energy, and degrade food produce energy and new chemical bonds use energy and produce new chemical bonds Question at position 20 20 Multiple Answer 2 points Question at position 20 Use the figure below to answer the corresponding questions. Exam Q. Fig 11-01-2.jpg The portion of the molecule in box 3 in the figure above is: Use the figure below to answer the corresponding questions. Exam Q. Fig 11-01-2.jpg The portion of the molecule in box 3 in the figure above is: a sugar. a protein. a pyrimidine. a purine. a nucleotide. Question at position 21 21 Multiple Answer 2 points Question at position 21 Glucose dissolves in water because: Glucose dissolves in water because: it ionizes. it is a polysaccharide. it has polar hydroxyl groups that interact with polar water molecules. it has a very reactive primary structure. it is hydrophobic