Bio principles Exam 2 – Brooks Latest Update Graded A+

Cytology the study of cells Robert Hooke - observed cork could float - discovered a honeycomb-like structure in a cork slice using a primitive compound microscope - only saw cell walls as this was dead tissue - coined the term "cell" for these individual compartments he saw Two types of microscopes: 1. Light Microscope 2. Electron Microscope Light Microscope - light is focused on specimen by a glass condenser lens - the image is magnified by an objective lens and an ocular lens - projection on photographic film Electron Microscope - a beam of electrons is used instead of light- bombards object with electrons to see small, precise images - electromagnets are used instead of glass lenses - the electron beam is focused on the specimen by a condenser lens - the image is magnified by an objective lens and projector lens - projection on a screen or on photographic film Two T