Here's a breakdown:

* Single-celled: They are made up of only one cell.

* Nucleus: They have a true nucleus, which separates their DNA from the rest of the cell. This is a characteristic of eukaryotic organisms.

* Cilia or flagella: These are hair-like structures that help the protist move.

* Cilia: Short, numerous, and beat in a coordinated way.

* Flagella: Longer, fewer, and whip-like.

Examples of protists with cilia or flagella:

* Paramecium: A protist with cilia that uses them for movement and feeding.

* Euglena: A protist with a flagellum that uses it for movement and also contains chloroplasts for photosynthesis.

* Chlamydomonas: A green algae with two flagella that uses them for movement and photosynthesis.

Note: While protists are a diverse group, not all protists have cilia or flagella. Some are amoeboid and move using pseudopodia (temporary extensions of the cell membrane).