Bacteria as Prokaryotic Cells

Steps:

• Define bacteria as single-celled prokaryotes without a true nucleus.
• Note key features: presence of cytoplasm and DNA, but DNA floats freely in nucleoid region.
• Eliminate options requiring nuclear membrane, as bacteria lack it.
• Select matching option based on prokaryotic traits.

Why A is correct:

• Bacteria are prokaryotes, defined by lacking a nuclear membrane enclosing DNA, while containing cytoplasm and genetic material (DNA).

Why the others are wrong:

• B: Nuclear membrane present describes eukaryotes, not bacteria.
• C: All cells, including bacteria, contain cytoplasm as the cell's internal fluid.
• D: Bacteria have DNA and cytoplasm; nuclear membrane is absent in prokaryotes.

Final answer: A