performed to aid in the identification of this unknown bacterium. Biochemical tests are a series of tests used to identify certain bacterium The various tests that are used in this lab are the catalase test‚ oxidase test‚ blood hemolytic test‚ MSA‚ blood agar‚ and PEA/ab sens test. A known Gram positive coccus bacteria will be used alongside an isolated Gram positive unknown bacteria for comparison to aid in the ability to identify the isolated organism to the genus level. There are many reasons for
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BIOLOGY – TRANSPORT ACROSS MEMBRANE define diffusion and describe its role in nutrient uptake and gaseous exchange in plants and humans define osmosis and describe the effects of osmosis on plant and animal tissues define active transport and discuss its importance as an energy-consuming process by which substances are transported against a concentration gradient‚ as in ion uptake by root hairs and uptake of glucose by cells in the villi . A cell is surrounded by a layer of cell surface membrane
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point each whereas Short-answer type questions will be worth 2 points each. This lab will be worth a total of 45 points but will be converted to a percentage grade when registered in your “Gradebook”. |ACTIVITY 1: Simulating Dialysis (Simple Diffusion) |Answers | |The molecular weight of urea is approximately 60. Which of the membranes can it pass through? |D
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Physioex 9.0 Review Sheet Exercise 1 Cell Transport Mechanisms and Permeability Name: Jeffery Cook Lab Time/Date: 12pm 2/09/2015 Activity 1 Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. a. Two variables that affect the rate of diffusion are size and whether or not there is an electrical or concentration gradient. 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction
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water-soluble substances cross the membrane through simple diffusion‚ facilitated diffusion and active transport. Osmosis is thought of as the diffusion of water from an area of high concentration of water molecules to an area of low concentration‚ across a partially permeable membrane. To define osmosis more accurately we define it in terms of water potential. Water potential is a measure of how easy it is for water molecules to move. Diffusion occurs because substances attract a ‘cloud’ of polar water
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Physioex 9.0 Review Sheet Exercise 1 Cell Transport Mechanisms and Permeability Name __Christopher Scott_ Lab Time/Date ___1/15/2014 Activity 1 Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. ___ Two variables that affect rate of diffusion are molecule size and plasma membrane composition. A larger molecule will diffuse more slowly than a smaller molecule. The lipid content of the plasma membrane determines permeability of certain molecules. A
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1/ What is the driving force in the diffusion? Randomness. As far as forces go i believe you can end up with a pressure if you have two different concentration on opposite sides of a membrane. Cells have been know to explode as a result of this effect. Wikipedia.org‚ "The World’s Encyclopedia" really says it best Search ’Molecular diffusion" "Molecular diffusion‚ often called simply diffusion‚ is a net transport of molecules from a region of higher concentration to one of lower concentration by
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differences in the interior and exterior of the cell. The second type is active processes which use energy known as ATP to power the transport. There are two main types of passive processes called diffusion and filtration. This can be split into different types such as simple diffisuion‚ facilitated diffusion‚ osmosis and filtration. The objective of these experiments is to provide information on the passage of solutes and water through semi permeable membranes and relate them back to the study
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The very first day of the Unknown project I was acquainted with Denise who was very friendly and was very nice as far as assisting me in the project. The first day we were introduced too various different forms of the unknown such as broth‚ Blood agar plate‚ MSA plate‚ MAC plate‚ and the EMB plate. Before that we had done the 3 phase isolate which we had a possible of 10 points of achieving. In the isolation plate we had too take the sample of our unknown‚ which was the letter G. After we had
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experiments were conducted. These tests were done over simple diffusion‚ facilitated diffusion‚ osmosis‚ filtration‚ and active transport by changing and observing different variables and how they affect transport through the membrane. Obtained was the understanding of the changing of the molecular weight cut off in a membrane‚ and how it does not play a part directly in changing the rate of diffusion‚ but instead determined if diffusion was accomplishable at all. Knowledge on the size of molecules
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