Identifying examples of carbohydrates

Steps:

• Recall carbohydrates include monosaccharides (e.g., fructose), disaccharides, and polysaccharides (e.g., amylose, cellulose).
• Examine each option for terms that fit carbohydrate classification: polyhydroxy aldehydes/ketones or their polymers.
• Verify A: fructose (monosaccharide), amylose (starch component), cellulose (plant fiber)—all carbohydrates.
• Eliminate options with non-carbohydrates or mismatched terms like deoxyribose (DNA sugar) or classes instead of examples.

Why A is correct:

• All terms are standard carbohydrates: fructose (C6H12O6 monosaccharide), amylose (linear glucose polymer), cellulose (β-glucose polymer), per biological classification.

Why the others are wrong:

• B: Deoxyribose is a modified sugar in nucleic acids, not a typical carbohydrate.
• C: "Monosaccharide" is a category, not a specific example; deoxyribose unfit.
• D: Lists valid carbs but mixes disaccharide (sucrose) with two polysaccharides without clear progression.

Final answer: A