Which of the following structures is found only in bacterial cells, not in plant or animal cells?

Rationale

Nucleoid is found only in bacterial cells, not in plant or animal cells.

The nucleoid is a region in the bacterial cell containing the main DNA genetic material. It is irregularly shaped and unlike the nucleus found in plant and animal cells, it is not bound by a nuclear membrane.

A (Cell membrane) YOUR ANSWER

The cell membrane is not unique to bacterial cells. It is a common structure found in all cells, including bacterial, plant and animal cells. The cell membrane functions as a barrier, protecting the inside of the cell from the external environment.

B (Ribosomes) YOUR ANSWER

Ribosomes are also a universal cellular structure, found in bacterial, plant, and animal cells. They are responsible for protein synthesis in the cell. Although there are differences in size and density between ribosomes in these different cell types, their presence is not exclusive to bacteria.

C (DNA) YOUR ANSWER

DNA is the genetic material found in all living organisms, including bacterial, plant and animal cells. Therefore, DNA is not a structure unique to bacterial cells.

D (Nucleoid) CORRECT

The nucleoid is unique to bacterial cells. While all cells contain DNA, the nucleoid is a specific region in bacteria where the main genetic material is found. Unlike the nucleus in eukaryotic cells (including plant and animal cells), the nucleoid is not surrounded by a nuclear membrane.

Conclusion

Among the given options, the nucleoid is the only structure that is unique to bacterial cells. While the cell membrane, ribosomes, and DNA are all essential components of bacterial, plant, and animal cells, the nucleoid, containing the main genetic material, is a feature only found in bacterial cells. This arrangement allows bacteria to have a simpler, more compact structure compared to eukaryotic cells, which have a membrane-bound nucleus.

Which of the following structures is found only in bacterial cells, not in plant or animal cells?

Nucleoid is found only in bacterial cells, not in plant or animal cells.

Related Questions

Related Quizzes

How familiar were you with this question?

Report an Issue

Rate this Practice Test