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Microscopy and observing cells: practical techniques

Cell biology • Cell structure

Key concepts

What you'll likely be quizzed about

  • A required practical exercise employs a light microscope to examine plant and animal cells.
  • Prepared slides often include onion epidermis for plants and cheek smears for animals.
  • Staining enhances contrast, making organelles visible, while a cover slip prevents drying and keeps specimens flat.
  • The method involves placing the slide on the stage, starting with the lowest power objective lens, focusing, increasing magnification as necessary, and recording the magnification for drawings.
  • Drawings must include clear outlines, labels for identifiable structures, and notes on magnification and scale.
  • Noticing differences between plant and animal cells, such as the presence of a cell wall and chloroplasts in plants versus the irregular shapes of animal cells, connects structure with function.

Flashcards

Test your knowledge with interactive flashcards

What unit is usually used to measure cell length?

Click to reveal answer

Cell lengths are typically measured in micrometres (µm), where 1 µm equals 1 × 10−6 meters.

Key notes

Important points to keep in mind

Record the magnification for every drawing to enable valid size comparisons.

Begin observations with the lowest power objective to locate the sample, then increase magnification for more detail.

Image size measurements and magnification calculations require consistent units (mm, µm, or nm as needed).

Use iodine for plant cells and methylene blue for animal cheek cells while observing proper safety precautions with stains.

Understand the distinction between magnification and resolution: magnification enlarges images, while resolution determines smallest visible details.

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