Arrow A is indicating a(n) _____ protein.
a) The cell membrane with many proteins that have different functions.
b) Arrow A is indicating a structure consisting of nine triplets, arranged in a cylinder, and located near to the cell membrane.
c) Arrow B is indicating a protein with an active site localized in the cytoplasm. Arrow C is indicating a small globular protein localized outside the cell.
d) Arrow D is indicating a transmembrane protein bonded with a green structure inside the cell.
e) Arrow E is indicating a transmembrane channel.
