CELLS

This is an Escherichia coli cell.1. What type of organism is E. coli?2. What is the type of this cell?3. What are the main characteristics of this type of cells?

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4. Write the names of 1, 2, 3 and 4.

5. What is the function of 1?

6. What is the function of 3?

Prokaryotic cells

7. What are ribosomes? What are they for?

8. What does nm mean? What is 1 nm?

9. What is the type of this cell?10. Write the names of the following structures:

(1), (2), (3), (4), (6), (7), (10)

11. What is the type of this cell?12. What are the main differences between the previous cell and this one?13. What are the main similarities between them?

14. Which number corresponds to...-Centrosome?-Smooth endoplasmic reticulum?-Nucleole?-Golgi body?-Mitochondrion?-Nuclear envelope?

This is an image of an eukaryotic animal cell.15. What type of microscope was used to take this image?16. What is the biggest part of this cell? What is its function?17. What is the cell organelle which occupies most space in the cytoplasm? What is its function?18. Which other parts the cell can you identify?

The eukaryotic cell: structure

19. How many plasma membranes can you distinguish in this picture?20. What types of cells have got plasma membrane?21. What is the name of 1?22. How many cells are (partially) represented in the picture?

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23. This image shows an important function of membranes. Complete the following paragraph with the words below:

The plasma membrane controls the .......................... of substances between the ................................ and the ............................ . Some molecules can pass ............................ through the plasma membrane, other molecules need the help of .......................... to pass through the membrane.

[directly, exchange, cytoplasm, proteins, environment]

24. What is the name of this cell organelle?25. What are the small dark patches (or granules) in the pictures?

26. What is this organelle?27. Complete the following text explaining its function. Use the words below.

The ................... .................... receives substances from the ................................ ........................... . These substances are ......................... , .................................. and ..................... inside or outside the cell.

[sent, Endoplasmic reticulum, Golgi body, modified, packed]

The eukaryotic cell. Golgi apparatus

28. These organelles are lysosomes. What is their function?

29. What are these organelles?30. What is their function?

31. Why are so many around the flagelle of each spermatozoid?

32. What is the main function of vacuoles?

The eukaryotic cell. Plant vacuoles

The eukaryotic cell. Chloroplasts

33. Why are chloroplasts green?What is their function?