5a Which of the following statements is false? © Extracellular signal molecules that are small and hydrophobic can bind to an intracellular receptor so as to signal a target cell to change its behavior. O The same signal molecules can induce different responses in different cells. O Different combination of extracellular signals causes different responses of target cells. O To function, all extracellular signal molecules must bind to specific receptors located on the surface of a target cell. 5b Which of the following statements about the plasmodesmata in plants is false? O The plasmodesmata in plants are functionally most similar to adherens junction in animals. O The plasmodesmata in plants are lined with plasma membranes on the surface. O Macromolecules can pass through plasmodesmata. O The presence of plasmodesmata in plants allows the cytoplasm to be continuous from one cell to the next.

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