Cells

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Across
  1. 3. Which organelle is called the powerhouse of the cell?
  2. 4. What are the thread-like structures in the nucleus?
  3. 5. Which organelle contains chlorophyll?
  4. 6. membrane What is the outer covering of an animal cell?
  5. 7. What is the basic unit of life?
  6. 8. What is the control center of the cell?
Down
  1. 1. Which instrument is used to observe cells?
  2. 2. Hooke Who discovered the cell?
  3. 5. What is the jelly-like substance inside the cell?
  4. 7. wall What is the outermost layer of a plant cell?