Which of the Following Makes It Necessary for Animal Cells

question 25

Multiple Choice

Which of the following makes it necessary for animal cells, although they have no cell walls, to have intercellular junctions?

• A) Cell membranes do not distinguish the types of ions and molecules passing through them.
• B) Large molecules, such as proteins and RNA molecules, do not readily get through one, much less two, adjacent cell membranes.
• C) Cell-to-cell communication requires physical attachment of one cell to another.
• D) Maintenance of tissue integrity and barriers to fluid leakage requires cells to adhere tightly to one another.
• E) The relative shapelessness of animal cells requires a mechanism for keeping the cells aligned.

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