Discussion
Which of the following statements about the cells of living organisms is/are correct ?
A. All are microscopic and cannot be seen with a naked eye.
B. All have a cell wall.
C. All have a nuclear membrane.
D. All have a cell membrane.
Choose the correct option :
Answer: A
The only correct statement is D: all cells have a cell membrane.
The cell (plasma) membrane surrounds every cell, plant, animal or bacterial, and controls what enters and leaves it.
The others have exceptions. Not all cells are microscopic: a hen's or ostrich's egg is a single cell visible to the naked eye, and some nerve cells are very long. Animal cells have no cell wall. Bacteria and blue-green algae are prokaryotes and have no nuclear membrane. So 'A and D', 'B and C' and 'Only A' are wrong.
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