Understanding Cells: Theory, Structure, and Functions
Explore the fascinating world of cells through the Cell Theory, differences between animal and plant cells, functions of organelles, and the characteristics of prokaryotic and eukaryotic cells. Learn about the basic units of life and the distinct features that define various types of cells.
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Presentation Transcript
The Cell Theory (Theodor Schwann) 1. All living organisms are made of either one (unicellular) or more cells (multi cellular). 2. The cell is the basic unit of life. 3. All cells arise from pre- existing cells.
Similarities between animal and plant cell : - both have nucleus -both have membrane bound organelles - both have cytoplasm Differences between animal and plant cell : - shape - vacuole (size) - size - Plant cell has a rigid cell wall in addition to cell membrane and it has chloroplast.
WALT know the functions of the organelles in a cell. http://sciencespot.net/Media/CellsOrganelles Wkst.pdf
Prokaryotic Cell - Bacteria are prokaryotes, lacking well- defined nuclei and membrane-bound organelles. Have many shapes and sizes, from minute spheres, cylinders and spiral threads to flagellated rods and filamentous chains. Found practically everywhere on Earth and live in some of the most unusual and seemingly inhospitable places. - -
Eukaryotic Cell - An animal cell has several membrane-bound organelles. - The genetic material DNA resides mainly in the nucleus, which is surrounded by a double membrane with numerous openings called nuclear pores. - Have structures such as centrioles, lysosomes, and cilia and flagella that are not typically found in plant cells.
Eukaryotic Cell - Plant cells are also eukaryotic cell. - They have membrane bound organelles. - Larger than animal cells and are typically rectangular or cube shaped. - Have cell wall, large vacuole and plastids, such as chloroplast.-
Video https://www.youtube.com/watch?v=URUJD5 NEXC8
Task : Watch the video and fill in the blanks. https://www.youtube.com/watch?v=1Z9pqST7 2is Bozeman Science Task : worksheets
Scientific Units of Measurement centimeter milimeter micrometer nanometer Cells micrometers Total magnification = Ocular lens/Eyepiece x Objective lens Magnification = Image size/Actual size
