Biology Lab T 10:50 The Effects of Alcohol on the Cell Membrane Introduction To understand the effects of alcohol on cell membranes can help one understand more about the effects of alcohol on human cells that are contained in the digestive system and the blood stream. It is important to study this effect due to the fact that it can lead to the understanding of the dangers of alcohol‚ over consumption‚ and even possibly alcohol poisoning. Performing this lab enables the students to have a firsthand
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Chapter 2: Patterns in Nature 1. Cell theory • 1590: Dutch grind glass lens (1st compound microscope) • 1665: Robert Hooke uses compound m. analysis thin cork slices as filled with air enclosed in boxes (cells) distinct • 1676: Dutch sees microorganism under microscope from pond water • 1824: French suggest all organisms composed of cells • 1827: Robert Brown (Brownian motion) discovered nucleus in plant cell • 1838: German produced evidence that all organisms made of cells • 1859:
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IB HL BIOLOGY Dialysis Lab: Exploring Osmosis and Diffusion Through A Membrane Introduction: Dialysis is the flow of certain solutes through a semi permeable membrane. Dialysis is usually used on patients with failing kidneys to clinically purify blood in their kidneys‚ or other regions of their bodies. The dialysate contains waste matter that flows from the blood our of the dialysis tubing. Question/aim of lab: To test the solutions inside and outside the dialysis tubing with Benedict’s
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envelope 2. Endoplasmic reticulum (ER) a. Rough ER-has ribosomes b. Smooth ER-lacks ribosomes 3. Golgi apparatus 4. Lysosomes 5. Vacuoles a. food vacuole b. contractile vacuole c. central vacuole 6. Plasma membrane D. Mitochondria E. Chloroplasts F. Peroxisomes G. Cytoskeleton (Table on page 113) 1. Microtubules a. cilia b. flagella 2. Microfilaments (actin) a. muscle contraction b. pseudopodia c. cyotplasmic streaming
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wider spread to compare the results‚ and check that I don’t have any anomalies Prediction Osmosis is the process of diffusion of water molecules from a weaker solution into a stronger solution‚ through a semi permeable membrane. The tiny pores in the membrane of the potatoes will allow the water molecules to go in and out of the potato cell‚ depending on the concentration gradient between the potato and the sucrose solution. If the water concentration is lower in the potato than
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prophase | B Chromosomes decoil to form chromatin. E Centrioles move to opposite ends of the cell. A Chromosomal centromeres split and chromosomes migrate to opposite ends of the cell. C Chromosomes align on the spindle equator. D Nuclear membrane and nucleolus disintegrate. Carbohydrates are stored in the liver and muscles in the form of this polysaccharide: B) glycogen. Mitochondria: B) contain some of the code necessary for their own duplication. Human cells have a pH range of
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process of the facilitated diffusion of glucose through a selectively permeable membrane. Introduction: Experiment #1 and #2 are meant to show the processes of Simple and Facilitated diffusion. Both the solutes and water were used to show how they diffuse through a semi permeable membrane. In experiment #1 the process of using the solute and deionized water shows how much of the solute is passed through the membrane. In experiment #2 the rate of facilitated diffusion relied on the amount of carrier
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ratio will experience the greatest weight change‚ because more water can move by osmosis across the potato cell’s semi permeable membrane. 2) If potato pieces are immersed in various salt solutions‚ then the pieces immersed in the most concentrated solution will experience he greatest weight change‚ because more water must pass across the potato cells semi permeable membrane by osmosis to achieve an equilibrium. The results from testing these hypotheses did not support either and were shown to be flawed
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You may also see proteins in the cell membrane that act as channels to help the movement along. Of course there is an in-between transport process where very small molecules are able to cross a semi-permeable membrane. Proteins are used to help move molecules more quickly. Since the cell membrane will not allow glucose to cross by diffusion‚ helpers are needed. The cell might notice outside fluids rushing by with free glucose molecules. The membrane proteins then grab one molecule and
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hard and fast‚ using more energy and oxygen than normal‚ eventually beginning to cause the cells to die. Both intracellular organelles have membranes. The lack of ATP affects the plasma membrane and that special calcium ATPases had stopped moving calcium from cytosol into the endoplasmic reticulum of his cardiac muscle cells The breakdown of the membranes of these structures affect the functions of his heart cells because they keep everything in order‚ helps to keep organelles organized and enables
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