Prepare for the Foundations of Biology Exam 1. Dive into key biological concepts with multiple choice questions, hints, and explanations. Ace the exam with our efficient study methods!

Multiple Choice

Which of the following is NOT a listed function of biological membranes?

Biological membranes organize and control cellular activity by forming boundaries, regulating what moves across them, hosting transport proteins, marking cells for identification, enabling communication, facilitating adhesion, and serving as platforms where some biochemical reactions take place. Among these roles, saying that membranes conduct electrical impulses isn’t a standard listed function. Electrical signaling in excitable cells arises from the coordinated flow of ions through channels and pumps across the membrane, creating and propagating membrane potentials. The membrane provides the stage for this activity, but “conducting electrical impulses” is not a direct, standalone function of membranes themselves. In contrast, storage of genetic information is a job for DNA, and photosynthesis is carried out by photosynthetic machinery in chloroplasts (with membranes hosting parts of the process), not by the membrane itself acting as a catalyst.

Biological membranes organize and control cellular activity by forming boundaries, regulating what moves across them, hosting transport proteins, marking cells for identification, enabling communication, facilitating adhesion, and serving as platforms where some biochemical reactions take place. Among these roles, saying that membranes conduct electrical impulses isn’t a standard listed function. Electrical signaling in excitable cells arises from the coordinated flow of ions through channels and pumps across the membrane, creating and propagating membrane potentials. The membrane provides the stage for this activity, but “conducting electrical impulses” is not a direct, standalone function of membranes themselves. In contrast, storage of genetic information is a job for DNA, and photosynthesis is carried out by photosynthetic machinery in chloroplasts (with membranes hosting parts of the process), not by the membrane itself acting as a catalyst.