Which of the following is FALSE? Biological membranes usually contain lipids, proteins, and carbohydrates. Membranes are two

Question

Which of the following is FALSE?
Biological membranes usually contain lipids, proteins, and carbohydrates.
Membranes are two molecules thick.
Simple membranes are impermeable to other molecules.
Membrane are held together noncovalently.
Proteins can allow specific molecules to cross membranes.

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