In the lecture, the speaker talks about the similarities and differences between eukaryote and prokaryote cells. At the beginning of the lecture, the speaker says that the human body consists of trillions of cells, and the number of bacteria in a human body is ten times than that of cells. But we don’t need to worry about it, because bacteria in the human body would do more good than harm to you. Also, the speaker mentions that bacteria contain DNA and genetic materials, which can reproduce DNA and transform it into RNA and protein. According to the speaker, the biggest difference between these two cells is an organelle, which is the membrane-bound compartment. Lastly, the speaker indicates that cells are eukaryotic, and eukaryote can be single-cell or multi-cell.