Structure and Function of Biological Macromolecules

AP Biology· difficulty 3/5

α-glucose and β-glucose differ in

  • A

    Number of oxygen atoms within the sugar ring

  • B

    Number of carbon atoms in the ring backbone

  • C

    Whether the ring contains a nitrogen atom

  • D

    Orientation of the -OH group at carbon 1

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Explanation

The C1 -OH points down (α) or up (β) in the ring form. This small difference produces starch (α) vs. cellulose (β) polymers.

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