Which of the following statements is correct?

  • A
    Cellulose is a linear polymer of $\beta-D-glucose$ molecules with $\beta-1,4-glycosidic$ linkages.
  • B
    Starch is a polymer of $\alpha-D-glucose$ molecules with $\alpha-1,4-linkages$ and some $\alpha-1,6-cross-linkages$.
  • C
    Proteins are polyamides of $\alpha-amino$ acids.
  • D
    All of the above statements are correct.

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