Lab Report Writing Why do students write lab reports? When you have reached the highest stage of academic career, it is essential to do research and laboratory works. Obviously, after working on an issue in the college laboratory, your professor may ask you to create the report on it. For most of the students, doing a practical experiment is very easy.
How does diffusion across the cell membrane work? What molecules pass through the cell membrane easier than others? Is there any influence of solute concentration to the net movement of water molecules across the cell membrane?
What is the effect of water potential on the cell membrane? Cell membranes act as a barrier for the cell. It keeps together enzymes, DNA, and pathways for metabolic reactions. Cell membranes dispose of waste products from the cell and lets important molecules, like water and oxygen, into the cell.
The membrane is semipermeable, meaning only specific molecule may enter the cell. The passing of molecules is either through active transport passage of materials using energy or passive transport passage of materials using kinetic energy. Molecules are in constant, random motion Brownian motion and if they collide with the membrane, they will rebound.
If the molecules are headed toward an open pore in the cell membrane, it may pass through the pore or rebound depending on its size to the pore. The passage of molecules across the cell membrane from an area of high concentration to low concentration is call diffusion.
The diffusion of water molecules across the cell membrane is called osmosis. Water is isotonic and moves freely across the cell membrane and helps maintain its fluid mosaic model characteristic. Hypertonic solutions are solutions with higher amounts of solutes and hypotonic solutions are solutions with a lower amount of solutes.
The movement of water across the cell membrane depends on the concentration of solutes on both sides of the cell membrane. When water moves out of the cell, the cell will shrink, and when water moves into the cell, the cell will swell and possibly burst.
Cell walls are present in plant cells which prevent the cell from bursting once it swells.
When water enters the plant cell, the membrane is pressed up against the cell wall and creates turgor pressure. Water potential is used to sum up the differences in solute concentration and pressure to predict the direction water will diffuse in living plant tissues.
Water potential is measured in bars, metric units of pressure equal to 10 newtons per cm2 or 1 atmosphere. The formula for water potential is: Pure water has a water potential of 1 atmosphere.
Dissolving substances in water will result the water potential dropping below zero. When solute concentration increases, water potential decreases.
Pressure potential may be positive, negative, or zero. Even though water is diffused in all directions, water will always diffuse from an area of high water potential to and area of low water potential. The process of the cell wall pulling away from the cell membrane in a plant cell is called plasmolysis.
If we determine the molarity of the sucrose solution that will help produce equilibrium between the solution and the contents of the potato cell, we can determine solute potential: If we add glucose-starch solution to a dialysis tubing bag and submerged it in a cup of distilled water and IKI solution, then glucose will leave the dialysis tubing bag through pores into the IKI solution through diffusion.
First, we poured mL of distilled water into a cup and added about 4 mL of IKI solution to the water and mixed well. We recorded the initial color of the solution in Table 1.
After we were finished, we discarded the used glucose test strip.Osmosis lab report 1. -A F F E C T O F C O N C E N T R A T I O N O N T H ER A T E O F O S M O S I SPrepared for:BIOLOGYPrepared by:ABDULLRHMAN ZAKIDate:1/12/ 2.
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Hi, . Sep 08, · Expert Reviewed. How to Write a Biology Lab Report. Seven Parts: Creating Your Title Page Writing Your Introduction Listing Material and Methods Explaining Results Drawing a Conclusion Crediting References Formatting Your Report Community Q&A Biology lab reports have a specific format that must be followed to 77%(29).
Osmosis 1 OSMOSIS By: Shelby Lazorka Lab Partners: Laurel Miner and Kristi Raible Biology Professor Aguayo October 31, 2. Osmosis 2 OSMOSIS INTRODUCTION: By definition, osmosis is the diffusion, or dispersion, of water through a selectively permeable membrane from a higher concentration to a lower concentration .
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If you are taking a biology course, you'll need to write biology lab reports. Learn how to use a good format to properly write a lab report. course, you'll need to write biology lab reports. Learn how to use a good format to properly write a lab report. How to Format a Biology Lab Report. Search the site GO. Science. Biology Basics Cells. AP BIOLOGY Diffusion and Osmosis Lab Report Lily Gao Block 2 Diffusion and Osmosis Lab Report Lily Gao I. Improving teaching methods for diffusion and osmosis, and thus to facilitating. Homework: Complete the Osmosis and Diffusion lab report. We will write a custom essay sample on Biology Osmosis Lab Report specifically for you for only $ $/page. Order now We will write a custom paper sample on Biology Osmosis Lab Report specifically for you. for only $ $/page. Order now. Search. Related Papers.
Besides, many of the students feel quite bored, while dealing with the intricate matters of science.