To observe and identify major animal cell structures and to relate the structure of the cell to its function. Like obligate parasites, they are only capable of reproduction within living cells. While photosynthesis takes place in the leaves of an onion containing chloroplast, the little glucose that is produced from this process is converted in to starch starch granules and stored in the bulb. Change the magnification up to x100 on the light microscope, and refocus the lens for image clarity if necessary. In a sense, viruses hijack the host cell and force it to produce more viruses through dna replication and protein synthesis.
How to observe human cheek cells under a light microscope. Human cheek cells the inside of your cheek is covered with epithelial cells. They will draw what they see for each type of cell, being sure to record the magnification which they are using, and answer post lab questions. Follow the same procedure for the bacterial capsules and cheek cells slides. Why are stains such as methylene blue used when observing cells under the microscope. If you missed the microscope lab we did in class, you will need to make it up by using a virtual microscope which can be accessed on the internet, the virtual microscope is a little more complicated than the.
List 2 organelles that were not visible but should have been in the. Images observed under the light microscope are reversed and inverted. List 2 organelles that were not visible but could be found in cells if you had a microscope with a better magnification. Hypothesis if i examine the cells through the microscope most of the. Exercise 3 biology 105 estimating the size of cells. Move your fingers down and to the right to place the cover slip over the cheek cell mixture. Gather one elodea leaf from the teacher and make a wet mount slide of the elodea.
Place a small drop of iodine solution onto a clean slide. Students make a wetmount slide of their own cheek cells and another of onion cells. Gently scrape the inside of your cheek with the flat side of a toothpick. Students will observe cheek cells under a microscope. Human cheek cells nucleus cytoplasm plasma membrane granules. List 2 organelles that were not visible but should have been in the cheek cell. These cells are constantly worn away and replaced by new cells. Arm portion of microscope that connects the body to the base base a stable bottom for the microscope to stand upright not labeled iris diaphragm allows light to settle onto slide. If you missed the microscope lab we did in class you will need to make it up by using a virtual microscope which can be accessed on the internet. Methylene blue stains negatively charged molecules in the cell, including dna and rna.
Plant cell elodea and onion and an animal cell cheek cell. Put a drop of water in the center of a glass slide. Jan 24, 2020 onion elodea leaf and cheek cell labs questions elodea leaf cell under microscope plant biology elodea pondweed experiments on microscopes 4 schools elodea leaf cell ilration from a microscope slide elodea lab. Prepare a wet mount, determine the magnification and size of the field of view, and determine the depth of field.
Cheek cells under the microscope requirements, preparation and staining. This lab outlines the procedure for obtaining a check cell sample, preparing a slide, and finding the cells on the slide. Ocular condenser stage course adjustment knob describe how total magnification is calculated. Cheek cells are eukaryotic cells cells that contain a nucleus and other organelles within enclosed in a membrane that are easily shed from the mouth lining. The microscope is used for looking at many specimens that cannot be seen with the. Students will discover that their skin is made up of cells. Human cheek cells experiment from microscopes for schools. Cheek cells under the microscope requirements, preparation and. Virtual microscope lab cheek cells the biology corner. As such it is a favorite in biology classrooms to show what a typical animal cell looks like. You will also use a slightly different type of light microscope called a stereoscopic dissecting microscope.
How does the ink appear under the microscope compared to normal view. You may want to print this handout in color learning objectives 1. Move your fingers down and to the right to place the cover slip over the cheek cell. Compound microscope describe the location and function of the following parts of the microscope. The virtual microscope is a little more complicated than the microscope we used in the lab but with patience you should be able to complete this activity. Spider web clear nail polish is all you need to see how amazing a spider web really is 2. Observing human cheek cells under a microscope is a simple way to quickly view and learn about human cell structure. Observe the cheek cells under low and high power of your microscope at the minimum you should observe the cell membrane, nucleus, and cytoplasm.
Pond water your favorite pond may be teeming with more life than you think. If we had a transmission electron microscope see textbook, notes, or internet, what organelles might we be able to see. Remove the microscope from the scopes cabinet and return to your work area. Outside of their host cells, viruses can survive as minute macromolecular particles. Mix a drop of water and a drop of methylene blue on a clean microscope slide. A light microscope can be used to observe objects as small. In class, we obtained cheek cells by scraping the inside of the mouth with a toothpick and then rubbing the toothpick on a drop of water with. Using a toothpick, gently scrape the inside of your cheek. Onion peel the cells are very clearly visible as compartments with. Make sure that you use both hands to support the microscope arm and base. Aug 26, 2018 ncert class 9 science lab manual slide of onion peel and cheek cells aim to prepare stained temporary mounts of onion peel and human cheek cells and to record observations and draw their labelled diagrams. Onion cells under the microscope requirements, preparation. Why does a specimen placed under the microscope have to be thin.
Its therefore easy to obtain them for observation under a microscope. Explain why the specimen must be centered in the field of view on low power before going to high power. With the flat side of the toothpick, gently scrape the inside of your cheek to collect cells. The animal cell that you will observe will be a human cheek epithelial cell that cells. This is an easy and fun experiment that will show kids the basic structure of a cell and its major. Ncert class 9 science lab manual slide of onion peel and cheek cells aim to prepare stained temporary mounts of onion peel and human cheek cells and to record observations and draw their labelled diagrams. Get up close and personal with human cells with this lab worksheet. To find out what an animal cells look like under a microscope.
The bulb of an onion is formed from modified leaves. I can identify the different parts of a microscope. Prepared human cheek cell slide blank microscope slide toothpicks with flat edge gloves methylene blue stain water in squirt bottle microscope paper, pencil, markerspaint wash and dry a blank microscope slide. This subject is important because in biology, we will be using the microscope many times during different laboratory exercises. Cheek cells do not move on their own, so you will not find two organelles that function for cell movement. Preparation of a wet mount on a microscope slide b. Lab 3 use of the microscope introduction in this laboratory you will be learning how to use one of the most important tools in biology the compound light microscope to view a variety of specimens. Human cheek cell virtual lab welcome to science with mr. When you want to see cells, you have to prepare them in a way that removes obstructions that would block your view and use the microscope properly to bring them into focus. If you missed the microscope lab we did in class, you will need to make it up by using a virtual microscope which can be accessed on the internet. Students observe plant and animal cells in the microscope, measure their size, and identify. What cell characteristic or cell structure of each organism can be used to explain the difference.
Microscope and the cell lab report purpose of the microscope describe the correct way to handle a microscope. The light microscope used in the lab is not powerful enough to view most organelles in the cheek cell. Exercise 3 biology 105 estimating the size of cells using a. Make sure that you are saving the images in your data folder. Instructional objectives demonstrate the proper procedures used in correctly using the compound light microscope. The virtual microscope is a little more complicated than the microscope we used in the lab, but it will not be difficult to use. May 16, 2017 cheek cells are easy to obtain and easy to see under a microscope. In general, the surface of a tree has a harder feel than does the surface of a dog. Students will explore their own cheek cells and onion cells from the skin of an onion using a microscope. Read pdf elodea cheek cell lab answers plasmolysis in elodea plant cells science netlinks purpose the purpose of this lab is to learn how to prepare a wet mound, to learn proper staining techniques and to examine human cheek cells and onion skin cells. The light microscope used in this lab is not powerful enough to view other organelles in the cheek cell.
Microscopes and cells objective to learn the proper use and care of compound microscopes. Use the information from history of the cell theory and virtual microscope lab activities to answer the questions below. Observe the increased cell detail that the extra magnification provides. Nov 14, 2014 process for obtaining, staining, and viewing cheek cells using a microscope. Cheek cells are easy to obtain and easy to see under a microscope. I can understand and explain the three parts of cell theory. A cell biology unit for grades 5 through 7 genome sciences. Position a cover slip at a 45 degree angle just inside the left edge of the solution. Cheek cells under the microscope requirements, preparation. Onion cells under the microscope requirements, preparation and observation. Many educational facilities use the procedure as an experiment for students to explore the principles of microscopy and the identification of cells, and viewing cheek cells is one of the most common school experiments used to teach students how to operate light microscopes. Scanning 4x low 10x high 40x the light microscope used in this lab is not powerful enough to view other organelles in the cheek cell. Students will discover that onions are made up of cells. Plant and animal cells lab objectives students will observe onion cells under a microscope.
Place the slide on the microscope, with 4 x or 10 x objective in position and find a cell. Determine the total magnification of the microscope. Compound microscope and cell structure and function f17. Observe the different details inside the human epithelial cheek cell, noting the cell membrane and nucleic structures inside the cell cytoplasm. Microscope, lens paper, letter e slide, color thread slide, 1 mm gridline slide. Rub the scrapings onto the center of a microscope slide. View lab report lab microscope with cells cheek cell. Adjust the microscope s lens to increase the magnification. Today%for%this%laboratory%we%will%be%using%a%compound%light% microscope. Animal and plant cells microscope lab onion and cheek cells by miss middle school teacher this is a quick and easy way to have students observe actual animal and plant cells.
This dye is toxic when ingested and it causes irritation when in contact with the skin and eyes. Today you will be viewing three types of eukaryotic cells. Human cheek cell blood cells discussion questions 1. Cheek cells use this sheet only if the class microscopes. Observing cells from a human cheek and bacteria under a compound microscope. This one period lab is a great way to introduce microscope skills or view animal cells using the students own cheek cells. Gently scrape the inside of your cheek with a toothpick.
Nov 15, 2019 label the nucleus, cytoplasm, and cell membrane. Types of cells that can be viewed under a basic compound microscope include cork cells, plant cells and even human cells scraped from the inside of the cheek. Add one drop of methylene blue onto the water and cell solution to stain the cheek cells for observation. Place the base securely on the lab bench with the arm towards you. Cheek cells are eukaryotic cells that are easily shed from the mouth lining. Fill out the table below to show what we could and could not see through our microscope. Microscope slide and coverslip toothpick water methylene blue. If i look at my cheek cell scraping under a microscope and put iodine on it, then i will see the different parts of the cell including the nucleus, cytoplasm, and cell membrane. Students will use a microscope to examine the structure of the onion epidermal cell with particular emphasis on the cell wall, cell membrane, cytoplasm and nucleus. I can explain why the microscope was invented and how it helped develop the cell theory. In this lab, you will prepare and observe cells from both a plant onion and an animal your own cheek. Introduction the purpose of this lab was to use the microscope and identify cells such as animal cells and plant cells.
Cut out the letter e and place it on the slide face up. Hypothesis if i examine the cells through the microscope most of the cells. To view cheek cells, gently scrape the inside lining of your cheek with a toothpick. Cheek swab take a painless cheek scraping to view the cells in your own body 3. The light microscope used in the lab is not powerful enough to view other organelles in the cheek cell. Students will observe onion cells under a microscope. To view your own human cheek cells under the microscope. Onion a simple layer of onion skin is a great introduction to looking at plant cells 4. You will need to use your microscope skills to focus in on each cell and draw conclusions from what you observe. Students can easily view their own cells as an example of eukaryote cells and cell theory. Identify cellular organelles in a stained tissue sample. Learners use a microscope to examine their own cheek cells, drawing diagrams of the cells and identifying the parts when they have focused in on a visible specimen.