Question 40

A prokaryotic cell is one of the smallest living cells, has a cell wall, and contains a nucleoid region.

Prokaryotic cells are characterized by their simplicity and small size, typically lacking a true nucleus, but they do contain a nucleoid region where their genetic material is located. Additionally, prokaryotic cells possess a cell wall, which provides structural support and protection.

A) It is one of the smallest living cells, has a cell wall, and contains a nucleoid region.

This statement accurately describes prokaryotic cells. They are indeed among the smallest living cells, usually measuring just a few micrometers in length. The presence of a cell wall is a defining feature of prokaryotes, offering protection and shape, while the nucleoid region is where the cell’s DNA is found, distinguishing it from eukaryotic cells that have a membrane-bound nucleus.

B) It is found in plants, has chloroplasts, and its DNA is contained in the nucleus.

This option incorrectly describes eukaryotic cells rather than prokaryotic cells. Chloroplasts are organelles found in plant cells and certain algae, and eukaryotic cells possess a true nucleus where their DNA is housed. Prokaryotic cells do not have these features.

C) It contains a nucleus, but lacks a cell wall.

This statement is inaccurate for prokaryotic cells. Prokaryotes do not contain a true nucleus; instead, they have a nucleoid region. Additionally, most prokaryotic cells do have a cell wall, making this option incorrect.

D) It contains a nucleus and membrane-bound organelles.

This option also describes eukaryotic cells, not prokaryotic ones. Prokaryotic cells are defined by the absence of a nucleus and membrane-bound organelles, which distinguishes them from eukaryotic cells. Therefore, this statement is false.

Conclusion

The correct answer is A, as it accurately encapsulates the essential characteristics of prokaryotic cells, including their small size, the presence of a cell wall, and the nucleoid region for DNA. All other options incorrectly describe features that belong to eukaryotic cells, thereby failing to represent prokaryotic cell biology accurately.