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The Plant cell

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الكلية كلية العلوم للبنات     القسم قسم علوم الحياة     المرحلة 1
أستاذ المادة هدى جاسم محمد التميمي       12/02/2018 13:19:08
Lab-2- The Plant cell.
(Prokaryote and Eukaryote cell)
What Are Cells?
All living things are constructed of cells; at least one (unicellular) or many (multicellular). Cell Theory, the very basic scientific truths about life and its smallest units, goes as follows:
1. All organisms are composed of one or more cells.
2. Cells are the basic unit of structure and function in organisms.
3. All cells come only from other cells.
Two Types of Cells
All cells fall into one of the two major categories. They are either prokaryotic or eukaryotic.
Prokaryotic Cells
Prokaryotes are evolutionarily ancient. These cells are simpler than eukaryotes and don’t contain a nucleus or any other membrane-bound organelles. Modern day bacteria (Eubacteria) and bacteria-like Archaea are prokaryotic organisms.
Eukaryotic Cells
Eukaryotes are more complex, having evolved from an ancestral prokaryote. Eukaryotic cells are the tiny units of life comprise most of the living things we are familiar with, such as animals, plants, fungi and protists (animal-like microbes).

The organelles in Eukaryotic cell. ( figure -1-)
Cell Wall. The cell wall encloses and protects the cell contents and plays a vital role in cell division and cell expansion. Composed of overlapping cellulose microfibrils, other polysaccharides and varying amounts of lignin, the cell wall is a relatively rigid structure in mature cells. It may vary in thickness and has pits that function in communication between cells. The region between the primary walls of adjacent cells, the middle lamella

المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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