Cellulose as a linear β-glucose polymer

Steps:

• Verify statement 1: Cellulose forms from glucose units via β-1,4 glycosidic bonds, confirming the linkage description.
• Verify statement 2: As a carbohydrate with hexose (six-carbon) glucose monomers, it qualifies as a polysaccharide.
• Verify statement 3: Cellulose consists of straight chains of β-D-glucose without branches, matching the unbranched macromolecule trait.
• Confirm all statements align with cellulose's known structure from plant cell walls.

Why A is correct:

• Cellulose is defined as an unbranched polysaccharide of β-glucose linked by β-1,4 glycosidic bonds, encompassing all three statements per biochemical standards.

Why the others are wrong:

• B omits 3, ignoring the unbranched β-glucose specificity.
• C omits 2, overlooking its polysaccharide classification.
• D omits 1, excluding the precise 1-4 glycosidic bond detail.

Final answer: A