Question

1. describe the ways in which protist cells are both similar to, and different from, the plant and animal cells you have already observed.

Explanation:

Protist cells share core eukaryotic features with plant and animal cells, but have unique traits that set them apart:

1. Similarities: All three are eukaryotic, meaning they have a nucleus enclosed by a nuclear membrane, membrane-bound organelles (like mitochondria, endoplasmic reticulum, and Golgi apparatus), and cytoplasm.
2. Differences from plant cells: Most protists lack a rigid cell wall (unlike plant cells with cellulose walls), and only some photosynthetic protists (like algae) have chloroplasts, while all plant cells have them. Many protists are motile (via cilia, flagella, or pseudopods), while most mature plant cells are non-motile.
3. Differences from animal cells: Some protists have cell walls (e.g., diatoms with silica walls) or chloroplasts, which animal cells never have. Protists can be autotrophic (photosynthetic) or heterotrophic, while all animal cells are strictly heterotrophic. Some protists reproduce asexually only, while animal cells typically use sexual reproduction (with some exceptions).

Answer:

Similarities to plant and animal cells:

• All are eukaryotic, with a membrane-bound nucleus, cytoplasm, and membrane-bound organelles (mitochondria, ER, Golgi apparatus, etc.).

Differences from plant cells:

• Most protists lack a rigid cellulose cell wall; only some (like algae) have cell walls of other materials.
• Only photosynthetic protists have chloroplasts, unlike all plant cells which contain them.
• Most protists are motile (via cilia, flagella, pseudopods), while most mature plant cells are non-motile.

Differences from animal cells:

• Some protists have cell walls (e.g., diatoms) or chloroplasts, structures absent in animal cells.
• Protists can be autotrophic (photosynthetic) or heterotrophic, while animal cells are exclusively heterotrophic.
• Many protists rely solely on asexual reproduction, while animal cells primarily use sexual reproduction.