Starter quiz
- In which type of cell is the genetic material not enclosed within a membrane-bound nucleus?
- prokaryotic cell ✓
- eukaryotic cell
-
- Which piece of apparatus is used in science laboratories to view cells?
- telescope
- hand lens
- magnifying glass
- microscope ✓
-
- In microscopy, what does the term magnification mean?
- making small objects appear larger in order to see more detail ✓
- the brightness of the light source
- the distance at which two distinct points of a specimen can still be seen
- the size of the microscope stage
-
- What is being described: "the distance at which two distinct points of a specimen can still be seen"?
- magnification
- brightness
- resolution ✓
- microscopy
-
On which part of a microscope is the specimen placed in order to view it?- 'stage' ✓
- What is the purpose of the objective lenses on a light microscope?
- to adjust the magnification ✓
- to control the amount of light
- to hold the microscope slide
- to provide structural support
- to adjust the focus
-
Exit quiz
- Starting with the smallest, sort the units of measurement into increasing size order.
- 1⇔nanometres (nm)
- 2⇔micrometres (µm)
- 3⇔millimetres (mm)
- 4⇔metres (m)
- How many nanometres are in a micrometre?
- '1000' ✓
- A bacterial cell has a diameter of 3.2 µm. What is its diameter in nanometres?
- 32
- 320
- 3200 ✓
- 3 200 000
-
- An nerve cell has a length of 3 mm. What is its length in nanometres?
- 0.00 0003
- 0.003
- 3 000
- 3 000 000 ✓
-
- A xylem vessel has a diameter of 62 µm, a bacterium cell has a diameter of 0.31 µm. How many times bigger is the xylem vessel than the bacterium?
- 0.005
- 5
- 20
- 200 ✓
-
- Calculate the magnification of a red blood cell with a length of 7 µm in an image measuring 14 mm.
- '2000' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Most animals and plants are made up of millions or billions of cells.
- Cells are usually too small to see with the unaided eye.
- Comparison of the sizes of eukaryotic and prokaryotic cells, and cell structures, in micrometres.
Common misconception
Pupils commonly convert units incorrectly, multiplying when they should divide or dividing when they should multiply.
It can help to relate the unit conversions in the lesson to an everyday example, e.g. pounds to pence.
Keywords
Million - 1 000 000, or one thousand thousand.
Billion - 1 000 000 000 or one thousand million.
Micrometre (µm) - One millionth of a metre, or 1 m / 1 000 000.
Magnification - Making small objects appear larger in order to see more detail.
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