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Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
any of a number of organized or specialized structures within a living cell   organelles  
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the semipermeable membrane surrounding the cytoplasm of a cell   cell membrane  
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a microscopic membrane of lipids and protiens that forms the external boundary of the cytoplasm of a cell or encloses a vacuole, and that regulates the passage of molecules in and out of the cytoplasm   plasma membrane  
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substances outside the cell   extracellular substance  
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substances inside the cell   intracellular substance  
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studies of the arrangements of molecules in the cell membrane have given rise to a model of its structure   mosaic model  
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powerhouse and brain of the cell   nucleus  
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