2 Matching Annotations
  1. Aug 2020
  2. www.ck12.org www.ck12.org
    5.15: Theory of Evolution by Natural Selection
    2
    1. quynhtana 13 Aug 2020
      proteins in the plasma membrane assist other substances in crossing the membrane.

      role of protein molecules

    2. quynhtana 13 Aug 2020
      Molecules of cholesterol help the plasma membrane keep its shape.

      role of lipid cholesterol

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    ck12.org/book/CK-12-Biology-Concepts