Question

question #19
two students observe a cell under a microscope and list several characteristics in a table.
based on the characteristics, how is the cell classified?
a the cell is a bacterial cell because it contains vacuoles.
b the cell is a plant cell because it contains both a cell wall and chloroplasts.
c the cell is a protist because there is one large vacuole.
d the cell is an animal cell because the genetic material is enclosed within a nucleus.

Explanation:

• Bacterial cells (Option A): Bacterial cells are prokaryotic. They lack a nucleus (the genetic material is in the nucleoid region) and do not have chloroplasts. While some bacteria may have vacuoles, the presence of a nucleus - like structure (even if at the edge, it's a true nucleus in this context) and chloroplasts rules out bacteria.
• Plant cells (Option B): Plant cells have a cell wall (for structural support), a cell membrane, chloroplasts (for photosynthesis), and a large central vacuole (which can push the nucleus to the edge of the cell). These characteristics match the given cell features.
• Protist cells (Option C): Protists are a diverse group. Some protists may have vacuoles, but not all have a cell wall and chloroplasts. For example, animal - like protists (protozoa) lack a cell wall and chloroplasts. The combination of cell wall, chloroplasts, and large vacuole is more characteristic of plant cells than the general protist group.
• Animal cells (Option D): Animal cells lack a cell wall and chloroplasts. They have small vacuoles (if any) compared to the large vacuole described here.

Answer:

B. The cell is a plant cell because it contains both a cell wall and chloroplasts.