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Transcript
Name:_______________________________________ INTRODUCTION TO CELLS (Panda book p.69-80) 3-1 The Cell Theory A cell is defined as ______________________________________________________________ ________________________. Cells contain structures called ___________________________. This terms means tiny _________________________. Cells were first described by the English scientist __________________ _________________, who thought that they resembled tiny rooms, or cells, where monks live. (Actually, ______________________ cells—just the _____________________ ________________ did not see living ___________ of dead cork cells.) The discovery of cells and their internal parts was made possible by the invention of the ____________________________ in the ____________ century. During the next two hundred years, the work of many scientists led to the development of the _______________ theory. This theory can be summarized in three statements: 1. _________________________________________________________________________________ 2. _________________________________________________________________________________ _________________________________________________________________________________ 3. _________________________________________________________________________________ 3-2 Structure and Function of Cells CELL PART DESCRIPTION Strong, stiff, nonliving layer outside the cell membrane, made of cellulose FUNCTION/JOB PLANT ANIMAL BOTH? Cell membrane Nucleus Allows materials to pass into or out of the nucleus Chromosomes Nucleolus One of a set of structures found in the nucleus; made of DNA, plus some protein Both Region between the nucleus and the cell membrane; consists of a jellylike substance that contains many organelles. Endoplasmic reticulum Small, grain-like body made of RNA, may be attached to the endoplasmic reticulum or floating freely in the cytoplasm; produced in the nucleolus. Rod-shaped organelle; located in the cytoplasm; has a smooth outer membrane and a greatly folded inner membrane Place where proteins are made. Both Vacuole Animal, rare in plant cells Lysosome Captures energy in sunlight and uses it to produce food Review of Ideas: 1. Name the organelles that are found in the cytoplasm:_______________________________________ 2. Name two cell parts that are found in plant cells and are not found in animal cells. _______________ ____________________________________________________________________________________ 3. Why is the process that takes place in the mitochondrion often described as being the opposite of the process that takes place in the chloroplast? _________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________