This resource is a cellular biology course site with clickable list that provides electron micrographs of various cell organelles and the like.

This illustration from Biology by Kenneth R. Miller and Joseph Levine describes the steps of the electron transport chain, the second stage in the process of cellular respiration.

This cell biology page is illustrated with photographs of plant meiosis taking place in a cell.

Moving materials across the cell membrane sometimes requires energy, called active transport. This tutorial covers both primary and secondary active transport with good clear animations.

This biocomplexity spiral diagram depicts the multileveled complexity of organisms in their environments, including molecular, cellular, habitat, ecosystem and others.

Through a combination of slide show tutorials and a video demonstration, learn how enzymes work. [3:00]