AP BIOLOGY

Detailed explanation-1: -A cellular response is the way that cells respond to signals in their environment. A cellular response is the third step in signal transduction, the pathway of receiving an external stimulus and causing a response.

Detailed explanation-2: -Cells communicate by sending and receiving signals. Signals may come from the environment, or they may come from other cells. In order to trigger a response, these signals must be transmitted across the cell membrane. Sometimes the signal itself can cross the membrane.

Detailed explanation-3: -The initiation of a signaling pathway results in a cellular response to changes in the external environment. This response can take many different forms, including protein synthesis, a change in cell metabolism, cell division and growth, or even cell death.

Detailed explanation-4: -Cytoplasmic signaling responses usually involve the signaling of a smaller, nonpolar molecule that can pass through the cell membrane in order to reach a cytosolic protein to initiate a signal response.