Brian Cox explains the origin of the mitochondrial symbiotic relationship with the cell. He starts with introducing the nucleus and gives context to the early cell types - prokaryotes and eukaryotes. Brian then explains what scientists believe was the beginning of a symbiotic relationship where a bacteria enters an archaea. 

A brief lesson on the origin of mitochondria and symbiosis.

Hank illustrates the differences between plant and animal cells. Both are eukaryotic cells, but they have their own unique characteristics. Hank also explains why humans cannot eat wood and plants in the way that other animals can. Key Words: Eukaryotic Cells, Prokaryotic Cells, Organelles, Cytoplasm, Cell Wall, Cellulose, Photosynthesis, Plastids, Chloroplasts, Central Vacuole

Hank explains active and vesicular transport then covers how cells regulate their contents and provide means to transport mechanisms.

Beakman explains how leaves lose chlorophyll using a cartoon video. Then he explains the role of chlorophlyll in photosynthesis verbally. To further demonstrate, Beakman acts like the "chef" chlorophyll that provides food for the plant.