BIOL 111 Study Guide - Midterm Guide: Amphiuma, Crystal Violet, Microscope Slide

• School: McGill University
• Department: Biology (Sci)
• Course: BIOL 111
• Professor: Multiple

Document Summary

Freshwater plant that provides refuge for small invertebrates and larval fish and amphibians. Thin cells on outer edge have only one layer. Thorn cells do not contain as many chloroplasts but their nucleus and nucleolus are visible allowing us to see cytoplasmic streaming (cytoplasm is continuously moving and you can often see chloroplasts moving around the cell) Iodine was added to kill the cell and makes the starch-containing pyrenoids (inside chloroplasts) visible it is blue/black. A vacuole would look like a hole in the middle of the chloroplasts and the plasma membrane is the inner membrane. Histological sections: thin slices of tissue applied to a microscopic slide (usually stained with dyes to allow for optical contrast when viewing. Selective staining: when different materials in the slide take up different dyes. This one dyed with safranin (red), fast green, and crystal violet (purple)