Biology cells, microscopes and tests

Here are just some images of cells to help with the identifying part of the assessment.

For how to prepare a side (with examples) How to prepare a slide: Using the knife and a flat clean surface cut a thin piece of the celery and potato (The piece should be thin and almost transparent). The onion and leaf should be peeled back until a small transparent skin-like piece is collected. With the small piece collected, use tweezers to lay on the middle of the slide and stretch out to be as flat as possible on the slide. Place 1-2 drops of water onto the leaf, 1-2 drops of Iodine on the potato and onion and have the celery pre-soaked in eosin dye. After place the liquid-element, using tweezers, slowly at a 45° angle to base lower the coverslip until it is flat to the slide. Gently press down and wipe away any liquid with paper towel. For drawing cells:* Always use a pencil * Use full lines - don't sketch the cells* Draw exactly what you see (as best you can) * Write the magnification used - NB - eye piece has a 10x magnification so add this to calculation * Label the cells organelles that are recognisable * When using pre-prepared slides, write down all information on the side (ie what cut) Examples of a drawn and sketched diagrams Drawn (correctly)

Sketched (incorrect) Note: The broken lines and coloured sections (if it needs colour add lines to indicate)

Chemical Substances in cells Chemical Indicator Heat/no heat Positive result Negative result Starch Iodine No Heat Blue-black/purple Yellow-brown, no colour change Glucose Benedict's solution Heat Orange-red Pale blue, no colour change Protein Biuret's test No Heat Purple Pale blue, no colour change Lignin 3 drops of toluidine blue No Heat Blue-green Pale blue, no colour changeChloride ions 3-5 drops of silver nitrate No Heat A white precipitate No Precipitate Lipids Brown Paper No Heat Paper turns translucent No change to paper