Identify structure d. the cell membrane. each letter marks a definite structure of the membrane. letter a marks the structure represented by a branched sequence on the integral protein. b marks a branched structure on the cell membrane. c marks a large elongated structure outside the cell. d marks part of the membrane, which consists of two rows of molecules. each molecule has a head and a tail. e marks a molecule, which is one of the membrane components. such molecules are randomly integrated in the membrane. f marks a structure that penetrates two layers of the membrane.
a. protein
b. phospholipid bilayer of membrane
c. cholesterol
d. extracellular matrix
e. glycoprotein