The Semipermeability of Cell Membrane to Different Osmotic Environments Using Dialyzing Bag Model1 Sittie Johaynnah M. Sambarani Group 3 Sec. I-1L December 17‚ 2012 ------------------------------------------------- ------------------------------------------------- ------------------------------------------------- ------------------------------------------------- 1 A scientific paper in partial fulfillment of the requirements in Biology 10 Laboratory under Professor Junaldo
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The process of osmosis and its importance to living organisms Osmosis is the process by which there is a net movement of water through a semi permeable membrane from an area of high water potential to an area of low water potential. Within a cell‚ osmosis has the following effect. If the water potential of the cell is lower than that around the cell water will move across a concentration gradient into the cell. If this is the case‚ the increase in water in the cell‚ may cause the cell to swell
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The results showed that the sucrose solution of 0.0M in the solution lacking AgNO3‚ showed the cells expanded‚ to the point of explosion from a hypotonic solution( Figure 1). Incipient plasmolysis occurred in the solution that contained AgNO3 in the sucrose concentration of 0.4M (Figure 2). In addition‚ the Elodea cells seemed to shrink as the sucrose concentrations’ increased without AgNO3. Therefore the results were that with the addition
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has a greater concentration of solute than another solution. In this the solvent‚ which is the substance doing the dissolving‚ will move from high to low concentration and both plant and animal cells will shrink due to water loss which is called plasmolysis. Plant and animal cells are both not fond of hypertonic solutions because they don’t want to shrink and have no way of fighting against it. The second type of solution is called a hypotonic solution. Unlike a hypertonic solution‚ hypotonic solutions
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1. Microbiology ⁃ M microscope ⁃ I independent unit ⁃ C comparatively less complex ⁃ R rapid rate of reproduction ⁃ O omnipresent ⁃ humans are living repositories of bacteria/microbes ⁃ borne sterile ⁃ microbe on all surface area of the body ⁃ sterile areas: eyes‚ brain‚ spinal cord‚ bones‚ kidney‚ internal organs ⁃ mutualistic relationship: we provide site and nutrient and microbes provide vitamin‚ aid in food digestion ⁃ division of microbial world ⁃ living component: organism
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the cell wall. These cells are said to be plasmolysed. When plant cells are placed in a solution which has exactly the same osmotic strength as the cells they are in a state between turgidity and flaccidity. We call this incipient plasmolysis. "Incipient" means "about to be". Plant cell structure: Plant Structure: How does Photosynthesis Work?:
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Ch. 1 Prokaryotes = bacteria ‚ archaea Eukaryotes = Fungi‚ protozoa ‚ algae (Growth:: Mitosis有絲分裂) Bacterial cell → Bacillus(rodlike) ‚ cocus (spherical)‚ spiral (curved) *P.S. 有時會star-shaped or square → 出現既形式: pairs‚ chains‚ clusters cell walls of bacteria → peptidoglycan (carbohydrate & protein complex) cell walls of plant and algal cell → cellulose Growth::Binary fission = bacteria reproduce by dividing into two equal cells bacteria 吸收nutrients from dead / living organisms/ photosynthesis
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Chapter 1 - Scientific Methods Objectives 1. Demonstrate a basic knowledge of classroom/science safety. 2. Understand the purpose of a hypothesis‚ and identify when a hypothesis should be used. 3. Be able to identify the independent and dependent variables in a formalized hypothesis. 4. Differentiate between an observation and an inference. 5. Contrast quantitative and qualitative observations. 6. Given a data table‚ draw and label a graph. Including a title‚ labeled units‚ and legend. 7
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where there is a high concentration of water to where there is low until both sides are equal. This is known as reaching equilibrium. A cell is turgid when it swells to its maximum volume due to large water content. Opposite to this is plasmolysis (or flaccid) where there is not enough water in the cell and the cell membrane begins to contract. Image courtesy of the BBC website. Factors which affect osmosis: The difference in concentration affects the speed ay which osmosis takes
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Name: Block: Honors Biology – Mid Term Review |Characteristics of Life | | |What is the difference between stimulus and response?|Stimulus: causes you to react/respond‚ ex: something that irritates your eyes | |Give an example of each |Response: reaction to/response to a stimulus‚ ex:
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