Exercises on microscope magnifications and conversions
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This document contains exercises on microscope magnification and size conversions. It asks students to calculate actual sizes of cells and organelles given microscope magnifications and drawn sizes. It also asks students to order common biological structures by size and define what a scale bar is in a microscopic image.
Exercises on microscope magnifications and conversions
- 1. Platon IB Diploma Programme Biology HL Exercises on microscope magnification and conversions 1. A student is using an optical microscope to observe a plant cell. He draws the cell image being 120 mm in length. The eyepiece lens magnification is 10X and the objective lens magnification is 40X. Calculate the actual size of the cell. (Assume that the student is drawing at the same scale with the magnified image) 3. Calculate the actual size of these Chlorella cells. You should measure Then prepare a table with the cell number, the image size and the actual (specimen) size. http://i1.wp.com/hplusmagazine.com/wp-content/uploads/mito1.gif 2. Explain what is a scale bar in any microscopic image. at least five cells. Write a number next to each cell that you measured.
- 2. 4. If a mitochondrion has a length of 10 µm and a student’s drawing of the mitochondrion is 20 mm, what is the magnification of the drawing? 5. Place the following organisms and structures in order of increasing size. Next to each organism/structure note the corresponding approximate size. (a) animal cell, (b) plant cell, (c) thickness of plasma membrane (d) virus, (e) molecules (f) mitochondrion 6. Calculate the actual size of this organelle which is a ________________ http://i1.wp.com/hplusmagazine.com/wp-content/uploads/mito1.gif