Final answer:
The function not attributed to cellular membranes is signal transition (option d). Membranes facilitate transporting solutes, signal transduction, and provide structural support and cellular identification among other roles.
Step-by-step explanation:
The biological function that is not a role of membranes is option d) signal transition. Membranes perform crucial roles such as transporting solutes, acting as a scaffold for biochemical activities, contributing to energy transduction, and conducting signal transduction. To clarify, signal transition is not a recognized function in the context of cellular membranes. Instead, one of their key functions is signal transduction.
The plasma membrane's sophisticated functions include transmitting signals through membrane receptors, enabling cellular responses to external stimuli such as hormones. Transport proteins within the membrane facilitate the movement of substances, utilizing passive diffusion or active mechanisms like pumps that require ATP. Membranes additionally provide structure, allow for cell identification, and regulate cellular flexibility and strength.