PPT-1.1 Intro to the microscope and Calculating cell size

Introduction to the Microscope Types of Microscopes Calibration Focusing Types of Microscopes Light Microscope   Ocular lens on eyepiece and objective lens on turret multiply magnification. OCR AS Biology. Unit 1: Cells, Exchange and Transport. Learning objectives. To understand and discuss the basis of cell theory based upon milestones in cell biology. To carry out practical work on cell size and magnifications using a light microscope. You are observing a specimen of . squamous. tissue under high power. . Each individual cell has an average diameter of 60. m. m and the diameter of the field of view is 2mm.. Calculate the maximum number of cells that are visible in the field of view.. All proteins needed. in cells are made here.. Organelles. that release most of the cells energy during respiration.. The. site where chemical reactions occur. Respiration occurs here- oxygen + sugar react to release energy the cell needs.. Key Terms. Resolution. : the ability to distinguish two separate points as distinct from each other. Magnification. : the number of times greater an image is than the object. Practicing magnification maths. Different types of microscopes. Objectives. Learners should . be able to:. explain how an electron microscope is different to a light microscope. define the terms magnification and resolution. convert units of measurement used in microscopy. . Pott. 1714 – 1788 . Chimney sweeps cancer of the scrotum . Pott’s. disease – vertebral tuberculosis. John Hunter. 1728 – 1793 . Papers at the Royal Society on experimental pathology, including the use of a microscope. The Microscope. An understanding of cells and the ultrastructure of cells had to wait until objects so small could be visualized by magnification.. Origin of the Microscope. The first record of the invention of a microscope was by Hans and Zacharias Janssen (Netherlands) in 1590?. Introduction. Robert Hooke examined slices of cork under a . . microscope . and decided to call the . ‘. pore-like. ’. . . structures . cells. .. Robert Hooke, through his observations, had discovered . Microscope Review The diagram represents a cell in the field of view of a compound light microscope. In which direction should the slide be moved on the microscope stage to center the cell in the field of view Where is the genetic material in a prokaryotic cell?. In a bacterial DNA loop and there may be one or more plasmid rings.. 2. Where is the genetic material in a eukaryotic cell?. The DNA is in chromosomes enclosed in a nucleus. . Care. Parts. Focusing. Always carry with 2 hands. Do not force knobs. Always store covered. Keep objects clear of desk and cords. Only use lens paper for cleaning. Microscope Care. Eyepiece. Body. . A. History of Cells & the Cell Theory. 2. Cell Specialization. 1. 1662-Anton van Leeuwenhoek. First to make and use a compound light microscope. He found tiny living things in water he called “. Light . microscope- uses light and lenses to enlarge tiny objects. Pollen grains – light microscope. Electron microscope - electromagnetic . lenses are used to direct . electrons onto the tiny specimen. •All living things are made of cells.. •Cells are the basic units of life.. •Cells come only from other cells. . Since the microscope was introduced biologists have examined the structure of living things. In most cases they have been found to be compose of cells. There are however some strange exceptions to the general cell pattern..