Difficulty: Hard

Average Score: 17%

What is true of a prokaryotic cell?

Rationale

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

Prokaryotic cells are characterized by their small size, the presence of a cell wall, and the existence of a nucleoid region where their genetic material is located. These features distinguish them from eukaryotic cells, which have a defined nucleus and membrane-bound organelles.

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

This statement accurately describes prokaryotic cells, which are typically unicellular and among the smallest known life forms. Their cell walls provide structural support, and the nucleoid region houses their DNA without a surrounding membrane, distinguishing them from eukaryotic cells.

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

This option incorrectly describes eukaryotic cells, particularly plant cells, which contain organelles like chloroplasts for photosynthesis and have their DNA enclosed within a nucleus. Prokaryotic cells do not have a nucleus or chloroplasts.

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

This statement is also incorrect as prokaryotic cells do not possess a nucleus; instead, their DNA is located in the nucleoid region. Additionally, most prokaryotes have a cell wall, which is essential for their structural integrity.

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

This choice describes eukaryotic cells rather than prokaryotic cells. Eukaryotic cells have a defined nucleus for DNA storage and various membrane-bound organelles, which are absent in prokaryotes.

Conclusion

Prokaryotic cells are defined by their simplicity, lacking a nucleus and membrane-bound organelles, while being small and possessing a cell wall and a nucleoid region for their DNA. Choice A correctly encapsulates these essential characteristics, distinguishing prokaryotic cells from their eukaryotic counterparts. Understanding these differences is fundamental to the study of cellular biology and the classification of life forms.

Related Questions

View all