When a red stain is added to a culture containing both living and dead cells, only the dead cells take up the stain. Which structure(s) prevent(s) the stain entering the living celis?
Correct answer: A. cell membrane
- A. cell membrane
- B. cell wall
- C. cytoplasm
- D. Vacuole
- E. all of these options
Explanation
The structure that controls the movement of substances into and out of the cell is the cell membrane, as it is selectively permeable.
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About Cell Structure and Function
Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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