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31. What does the cell theory state?

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32. Name two cell organelle which are bounded by a single membrane.

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33. Name two cell organelle bounded by double membrane.

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34. Which is controlling centre of a cell ?

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35. What is the power house of a cell ?

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36. What is cell culture ?

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37. Name the non-membrane bound organelle which helps in cell division in animal cells?

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38. Who discovered that the animal cells lacked cell wall ?

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39. What are energy transducers ?

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40. How many layers constitute the cell membrane of a cell ?

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