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Transcript
BTEC Biology 3.1 Cells Mrs Barnes Y Dderwen Assignment 3.1 • Students take the role of scientists working for one of the labs that has taken part in the Human Genome Project. Your task is to produce an illustrated booklet for the public, explaining the importance of the science behind the Project. • Students can work in small groups for the microscope work, but produce their booklets individually. • The booklet, when complete, will comprise a brief account of how the functioning of an organism relates to the genes in its cells. The first task here is to explain the location of genetic material. Later, students will add diagrams to show the organisation of cells into tissues and to show different types of cell. Then they describe how genes work, how those that are ‘switched on’ control the cell’s function, and, working together as a whole, determine the characteristics of the organism. Objectives • Identify a plant and an animal cell • Identify the components of each cell and label a diagram • Describe the function of each cell components Pathology • Cells are very small. • They are the basic building blocks of all animals and plants. These photographs show cells seen through a microscope. These photographs show cells seen through a microscope. Animal Cell Cheek cell Plant Cell Onion epidermis cell These photographs show cells seen through a microscope. Plant Cell Are 10 x the size of animal cells Task 1 • Draw and label an animal (and a plant cell) • You need to include a table of the parts and their function (so we only need 1 table if they are both on the same sheet A Plant and Animal Cell parts and function Table here Animal cell here Plant cell here coursework • Your poster must be neat, coloured in and contain: • Labelled diagram of plant cell • Labelled diagram of animal cell • Table of cell component functions • When this is complete, and to an acceptable standard you may complete the practical. Examining a real cell • We shall make a slide of onion epidermis • Follow the instructions from the help sheet • Draw a cell you can see and identify what you can see • What is missing? Can you come up with a reason why? Place a small drop of water on a clean microscope slide. Your teacher will slice through an onion. Take off one of the ‘leaves’ of the onion using a pair of forceps. Then, using the forceps, carefully peel off a small piece of inner onion skin, or epidermis. Place the onion epidermis in the drop of water on the microscope slide. Use a mounted needle to remove any folds in the onion epidermis. Gently lower a cover slip onto the onion epidermis, taking care not to trap any air bubbles under the cover slip. Place one drop of iodine solution at one side of the cover slip. Place a quarter of a piece of filter paper at the other side of the cover slip. This will draw the stain under the cover slip so as to stain the cells.