Humans can digest starch but not cellulose because

Question

Accepted Answer

C. starch's α-(1→4) fits; cellulose's β-(1→4) doesn't

Both are pure glucose.
The difference is bond geometry.
α-(1→4) gives starch a flexible helix that human amylase can hydrolyse.
β-(1→4) gives cellulose a straight rigid chain that human enzymes cannot reach.
Ruminants have gut bacteria whose enzymes can.

Answer

humans only digest molecules below 1000 Da

Answer

cellulose contains no glucose

Answer

cellulose is found only in animals

Humans can digest starch but not cellulose because

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