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Cell Membrane Tissues & Organs Definitions PowerPoint Presentation

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Slide 1 - Cells and Organelles; The Cell Membrane Book Reference: p.16-p.19
Slide 2 - Do all membranes have the same basic structure? Both the cell surface membrane and the membranes surrounding certain organelles have the same basic structure. Much of the membrane is made up of a 'sea' of phospholipids with protein molecules 'floating' in between the phospholipids.
Slide 3 - Where are proteins located within the membrane? What is an intrinsic protein? What is an extrinsic protein? Why is it called the fluid mosaic model?
Slide 4 - INTRINSIC 1: Channel Proteins Allow movement of substances, such as glucose, across the membrane NO ATP REQUIRED
Slide 5 - Actively transport substances, such as minerals, across the membrane ATP is REQUIRED INTRINSIC 2: Carrier Proteins
Slide 6 - (a) Channel VS (b) Carrier Proteins
Slide 7 - Bilayer; Phospholipids What is the bilayer? The phosphate heads are polar molecules and so are water-soluble. The lipid tails are non-polar and therefore are not water-soluble.
Slide 8 - Why do phospholipids have both a hydrophilic and a hydrophobic part? The phosphate heads are polar. Are they water-soluble? The lipid tails are non-polar. Are they water-soluble?
Slide 9 - What is a polysaccharide? Clue: polymer; monomer; carbohydrate
Slide 10 - ppt slide no 10 content not found
Slide 11 - Glyco……what? What is the difference between a glycoprotein and a glycolipid?
Slide 12 - What is the role of glycoproteins? They may help in the recognition of, and interaction with, other cells. They may also play a part in the recognition of hormones and foreign molecules.
Slide 13 - What is the role of cholesterol in the cell membrane? Cholesterol is also present in the membrane. It maintains the fluidity and increases the stability of the membrane. Without cholesterol the membrane would easily split apart
Slide 14 - Cell membrane: Functions Selectively permeable barrier. Structural, keeping the cell contents together. Allows communication with other cells. Allows recognition of other external substances. Allows mobility in some organisms, e.g. amoeba. The site of various chemical reactions.
Slide 15 - Cells and Organelles; Tissues Some organisms do exist as single cells - for example, Amoeba, but many organisms are multicellular and consist of from hundreds to billions of cells. The functions of the organism are divided up amongst the groups of cells, which become specialised for particular roles. Specialised cells show division of labour by being grouped into tissues.
Slide 16 - What is a Tissue? Definition A tissue is defined as a collection of cells, together with any extracellular secretion, that is specialised to perform one or more particular function. Tissues may contain only one type of cell, or several types.
Slide 17 - Website Reference: www.s-cool.co.uk go to Biology and then: 1.Cells and Organelles 2.Gas Exchange 3.Transport
Slide 18 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com Is home to well over a thousand powerpoints submitted by teachers. This a free site. Please visit and I hope it will help in your teaching
 

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