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Cells PowerPoint Presentation

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fakkulal

Description : Ppt Presentation on Cells which is created by Stu S and available for free download Cells powerpoint presentation.

Tags : Cells

Published on : Aug 18, 2018
Views : 1513 | Downloads : 0

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Cells Presentation Transcript

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Mitochondria Mitochondria are membrane-enclosed organelles distributed through the cytosol of most eukaryotic cells. Their main function is the conversion of the potential energy of food molecules into ATP. Every type of cell has a different amount of mitochondria.. There are more mitochondria in cells that have to perform lots of work, for example- your leg muscle cells, heart muscle cells etc. Other cells need less energy to do their work and have less mitochondria.

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Mitochondria have: an outer membrane that encloses the entire structure an inner membrane that encloses a fluid-filled matrix between the two is the intermembrane space the inner membrane is elaborately folded with shelflike cristae projecting into the matrix.

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Endoplasmic reticulum (ER)- It is a network of membranes throughout the cytoplasm of the cell. There are two types of ER. When ribosomes are attached it is called rough ER and smooth ER when there are no ribosomes attached. The rough endoplasmic reticulum is where most protein synthesis occurs in the cell. The function of the smooth endoplasmic reticulum is to synthesize lipids in the cell. The smooth ER is also helps in the detoxification of harmful substances in the cell.

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The fluid mosaic model describes the structure of the plasma membrane.Different kinds of cell membrane models have been proposed, and one of the most useful is the Fluid-mosaic model. In this model the membrane is seen as a bilayer of phospholipids in which protein molecules are embedded. An illustration of the Fluid mosaic model

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Lysosomes function as the cell's recycling compartment. Lysosomes receive cellular and endocytosed proteins and lipids that need digesting. The metabolites that result are transported either by vesicles or directly across the membrane.

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Steps in lysomal formation The ER and Golgi apparatus make a lysosome (2) The lysosome fuses with a digestive vacuole (3) Activated acid hydrolases digest the contents

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The centrosome, also called the "microtubule organizing center", is an area in the cell where microtubles are produced. Within an animal cell centrosome there is a pair of small organelles, the centrioles, each made up of a ring of nine groups of microtubules. There are three fused microtubules in each group. The two centrioles are arranged such that one is perpendicular to the other. During animal cell division, the centrosome divides and the centrioles replicate (make new copies). The result is two centrosomes, each with its own pair of centrioles. The two centrosomes move to opposite ends of the nucleus, and from each centrosome, microtubules grow into a "spindle" which is responsible for separating replicated chromosomes into the two daughter cells.

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cilia are thread-like projections of certain cells that beat in a regular fashion to create currents that sweep materials along;

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Flagella may extend to the rear of a cell and push it forward by snakelike wriggling, or stick out in front and draw it along. We humans possess both flagella and cilia. Each sperm cell is propelled by a trailing flagellum that accelerates the little torpedo forward in its quest to fertilize an egg.

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One of the most important distinguishing features of plant cells is the presence of a cell wall, a which serves a variety of functions. The cell wall protects the cellular contents; gives rigidity to the plant structure; provides a porous medium for the circulation and distribution of water, minerals, and other small nutrient molecules; and contains specialized molecules that regulate growth and protect the plant from disease. A structure of great tensile strength, the cell wall is formed from fibrils of cellulose molecules, embedded in a water-saturated matrix of polysaccharides and structural glycoproteins. .

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Vacuoles and vesicles are storage organelles in cells. Vacuoles are larger than vesicles. Either structure may store water, waste products, food, and other cellular materials. In plant cells, the vacuole may take up most of the cell's volume. The membrane surrounding the plant cell vacuole is called the tonoplast.

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Epithelial Tissue Epithelial tissues come in three basic types: squamous, cuboidal and columnar. These three types of tissue are seen in either simple (only one cell layer thick) or stratified (many cells in thickness) arrangements. The Simple Epithelial Tissue Types

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Simple Cuboidal Epithelium: Simple Columnar Epithelium:

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The Stratified Epithelial Tissue Type It is called pseudostratified due to the differing heights of the cells and the nuclei within the cells, making the epithelium look as if it is multilayered (stratified). The prefix, "pseudo" means "fake" or "not real", so pseudostratified literally means, "not really multilayered."

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Palisade mesophyll is a tissue made up of many similar cells

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Parenchyma cells- most abundant cells in plants; spherical cells which flatten at point of contact; alive at maturity; pliable, primary cell walls; large vacuoles for storage of starch, fats, and tannins (denature proteins); primary sites of the metabolic functions such as photosynthesis, respiration, and protein synthesis; Specialized parenchyma: Chlorenchyma- photosynthetic cells; have high density of chloroplasts

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This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.

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