What are some similarities between bacteria and protists? 

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Bacteria are usually more familiar to most people than protists, because bacteria are almost always covered in high school and college science classes, and are regularly brought up in the media for various reasons such as health and manufacturing. Protists, on the other hand, tend to be left out of most introductory science courses, or at least glossed over, in part because they aren't as distinct or recognizable a group and don't do as much to teach us about the different forms of life. Protists aren't even a "real" group, at least not in terms of evolutionary classification; the term is just something of a catch-all for single-celled eukaryotes, and isn't an accurate way of describing specific relationships between these organisms and anything else, including other protists.

What bacteria and protists do have in common is pretty much anything you can see in a typical "prokaryote vs. eukaryote" cell diagram. Both are cells containing a membrane, cytoplasm, DNA, RNA, ribosomes, proteins, a means of producing ATP (probably from glucose), a method of internal transport, and a method of reproduction (interestingly, protists retain the ability to reproduce asexually, like bacteria, although many can also reproduce sexually via meiosis, like more complex multicellular eukaryotes). Both classes have the potential to be beneficial, harmful or irrelevant to human life, and both can survive more extreme conditions than multicellular organisms.

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