Final answer:
The correct classification for the structures as lipids or carbohydrates is J - Lipid, D - Carbohydrate, E - Lipid, and H - Carbohydrate. Lipids include fats, oils, phospholipids, and steroids like cholesterol, and are defined by solubility. Carbohydrates, categorized as monosaccharides, disaccharides, and polysaccharides, are vital for energy and structural support in cells.
Step-by-step explanation:
The correct answer to the student's inquiry about the classification of the depicted structures into lipids or carbohydrates is option A: J - Lipid, D - Carbohydrate, E - Lipid, H - Carbohydrate.
Lipids are a diverse group of compounds known for being nonpolar and hydrophobic. They include fats, oils, waxes, phospholipids, and steroids. Lipids are defined by their physical property of solubility; they are more soluble in organic solvents than in water. Fats, or triglycerides, are composed of glycerol and fatty acids and are used for energy storage. Steroids, which include cholesterol, have a characteristic structure of four fused carbon rings.
Carbohydrates are biological molecules consisting of carbon, hydrogen, and oxygen atoms and serve as a major energy source for cells. They are classified into monosaccharides, disaccharides, and polysaccharides based on the number of sugar monomers. Monosaccharides, like glucose, fructose, and galactose, form the building blocks for larger carbohydrates. Disaccharides include molecules such as lactose and sucrose. Polysaccharides, like starch and glycogen, are long chains used for energy storage, while others, like cellulose, provide structural support.