AP BIOLOGY

Detailed explanation-1: -A cell within a multicellular organism may need to signal to other cells that are at various distances from the original cell (Figure 1). Not all cells are affected by the same signals. Different types of signaling are used for different purposes.

Detailed explanation-2: -Receptors come in many types, but they can be divided into two categories: intracellular receptors, which are found inside of the cell (in the cytoplasm or nucleus), and cell surface receptors, which are found in the plasma membrane.

Detailed explanation-3: -Not all cells respond to the same signals, and one cell may respond to the same signal in different ways. Different cells can respond in different ways to the same signal. The way a cell responds to a particular signal depends on the signal transduction pathways present in the cell.

Detailed explanation-4: -In fact, there are hundreds of receptor types found in cells, and varying cell types have different populations of receptors. Receptors can also respond directly to light or pressure, which makes cells sensitive to events in the atmosphere.