1. Which of the following statements is always true? a. all cells have a cell membrane b. all cells contain a nucleus c. all cells have a cell wall Choice (b) is incorrect because prokaryotic cells lack a nucleus. However, even though prokaryotic cells lack a nucleus, they do contain genetic material. It is just not separated from the rest of the cell by a nuclear envelope or membrane. Choice (c) is incorrect because animal cells don't have a cell wall. |
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