Examines intracellular mechanisms, including transport of ions and small molecules across membranes; protein targeting to organelles; membrane trafficking between organelles; signal transduction; the cytoskeleton; and the cell cycle. Analysis of these activities is from the experimental perspective established in MCDB 3135. Prereq., MCDB 3135. Recommended prereq or coreq., MCDB 3140 concurrent with either 3135 or 3145. Students may not receive credit for MCDB 3145 and 3500.