1. 3.1.3 Microscopes L.O: to distinguish between magnification and resolution to calculate the size of cells Starter: Complete word gap sheet, recalling information on cell organelles from last lesson.

2. Inside the nucleus, there is a n__________ which makes r________________. These can be in the cytoplasm, or attached to _________ ___________________ ______________, they are the site of p____________ synthesis. Smooth E.R. makes __________ and ______________. Once these biological molecules have been created, they are sent to the ________ ____________ to be modified, and then packaged into ____________. If these ____________ contain enzymes, they are known as _________________. Along with the help of ATP released by aerobic respiration, these modified biological molecules can attach to the _________ _________ and be excreted by the cell (exocytosis).

3. Cell Size and Scale http://learn.genetics.utah.edu/content/begi n/cells/scale/http://learn.genetics.utah.edu/content/begi n/cells/scale/

4. But how do we know this?

5. … Microscopy! Microscopes are instruments that magnify the image of an object Micro = smallscope = to see / look

6. Observing Cells Under a Microscope Carefully prepare your slide Observe the cells under the light microscope Increase the magnification – what happens? Draw what you can see (when focused) Label the organelles

7. Magnification vs Resolution (L.O.1) Magnification is the number of times larger an image is compared with the real size. Resolution is the ability to distinguish between two points. **** An increase in magnification does not mean an increase in resolution! ****

8. Calculating Cell Size (L.O.2)

9. Homework Complete ‘Microscopes’ worksheet for Tues 13 th Sept. Please ask for help on Monday if you are stuck or unsure of anything.