Cell Wall and Magnification Factor

Cell Magnification

Fig. 1.2.1 below shows an animal cell

[pic]

_________ 5(m

Fig. 1.2.1 Diagram showing the general structure Of an animal cell as seen under the electron microscope

1. Calculate the magnification factor

2. Calculate the length of structure G

3. Calculate the diameter of the nucleolus

4. Calculate the diameter of the nucleus

5. Calculate the diameter of the cell at its widest point

The diagram below shows a plant cell

[pic] ___________ 40(m

Fig. 1.2.2 Diagram showing the generalised structure of a plant cell as seen with an electron microscope

1. Calculate the magnification factor.

2. Calculate the thickness of the cellulose cell wall.

6. Calculate the length of the cell.

7. Calculate the length of structure C.

8. Calculate the length of the vacuole.

Answers
1) Calculate the magnification factor The line 5 (m is 20 mm long. So 20 000 (m = 5 (m

Magnification is 20 000/5 = x 4 000.

2) Calculate the length of structure G Length of G is 12 mm = 12 000 (m

Magnification is x 4 000

Real size is 12 000/4000 = 3 (m

3) Calculate the diameter of the nucleolus Diameter is 8 mm = 8 000 (m

Magnification is x 4 000

Real size is 8 000/ 4 000 = 2(m

4) Calculate the diameter of the nucleus Diameter is 36 mm = 36 000 (m

Magnification is x 4 000

so real size is 36 000/4 000 = 9 (m

5) Calculate the diameter of the cell at its widest point 109 mm = 109 000 (m = 109 000/4 000 = 27–25 (m

For all the answers above there is a tolerance limit of + or – 0.5mm, so + or – 0.1 – 0.2 (m

There are other perfectly correct ways of doing the calculation, so if your method is