Both beakers would contain 9. Brown, Cell membrane, Color 609 Words 3 Pages Exercise 1: Cell Transport Mechanisms and Permeability Worksheet Assignment Due: Week 2 Student instructions: Follow the step-by-step instructions for this exercise found in your text and record your answers in the spaces below. The molecules have to rely on carrier porteins which varies in number due to the available membrane transport. The effect of increasing the concentration of sodium chloride from 9 mM to 18 mM in the left beaker was to You correctly answered: b. However, with each run, I changed dialysis membranes.
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. Experiment simulations examine substances that move passively through a semipermeable membrane, and those that require active transport. You will compare the intensity of the beetroot pigment that has leaked out from the cells subjectively and possibly objectively using. In this experiment I aim to find out the relationship between the leakage of red pigment from a beetroot cell and the surface area. PhysioEx allows you to repeat labs as often as you like, perform experiments without harming live animals, and conduct experiments that are difficult to perform in a wet lab environment because of time, cost, or safety concerns.
The second experiment simulates filtration of sodium, urea, glucose, and powdered charcoal. When I decreased the number of sodium-potassium pumps, the solution transported at a much slower rate than it would if the pump was set at 500. Simple diffusion is the net movement of substances from a region of high concentration to a region of low concentration. If the membrane is composed of lipid portion. In these experiments we used different sized membranes as well as NaCl, urea, glucose, albumin, powdered charcoal… For Learning Centre use only Activity 1: Simulating Dialysis Simple Diffusion Lab Report Review Sheet Results 1.
To describe the processes that account for the movement of sub- stances across the plasma membrane, and to indicate the driving force for each. Add K+Cl- to the beaker on the left. No chart necessary here, but you will need to use the data you get from running the experiments to answer the questions below Questions:? To describe the processes that account for the movement of sub- stances across the plasma membrane, and to indicate the driving force for each. Our prediction was correct, the Urea was unable to diffuse though such a small membrane. There are two main types of passive processes called diffusion and filtration. My prediction matched the results.
Acid, Ammonia, Chemistry 533 Words 2 Pages Introduction Cell structure and function can be defined in many aspects but one the most important characteristic is that it is enclosed within a cell membrane called a plasma membrane. Abstract The human body is made up of numerous cells that undergo various internal processes. Filtration is dependent upon a You correctly answered: b. The size of the thoracic cavity increases. The membrane was placed between the top and bottom beaker. This lab report is worth 50 points towards your final lab grade. Describe two Variables that affect the rate of diffusion.
Every copy now includes the newly expanded PhysioEx 8. The smaller solutes tend to be consistently more successful in all forms of transport. Master your assignments with step-by-step solutions to countless homework questions asked and answered by our members. Cell membrane, Drinking water, Potato 1865 Words 5 Pages Cell Transport And Homeostasis The roles of different types of cell-membrane proteins in the preservation of body organs donated for transplant is very vast. Adenosine triphosphate, Cell, Cell membrane 5029 Words 14 Pages Content Frame PhysioEx 9. Hypothesis I believe the plasma membrane is selective about what is able to and not able to pass.
. Results Exercise 1: Cell Transport Mechanisms and Permeability: Activity 1: Simulating Dialysis Simple Diffusion Lab Report Pre-lab Quiz Results You scored 75% by answering 3 out of 4 questions correctly. New York : Pearson Custom Publishing, 2009. Version 42-0034-00-01 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. Conclusion My hypothesis was proven to be correct, because when the concentration of sodium chloride was increased from 9mM to 18mM in the left beaker, the rate of diffusion did increase. Temperature also affects the membrane.
Everything alive consists of cells. Those that move passively through the membrane will do so in these simulations by facilitated diffusion and filtration. Negative What does it mean that the voltage just inside the membrane is negative? The filtration rate of Na+Cl- in the simulation was dependent on a. Activity 3: Observing Diffusion Through Nonliving Membranes pp. Concentration, Diffusion, Facilitated diffusion 609 Words 3 Pages effect of variation in temperature on the permeability of cell membranes using fresh beetroot Aims In this investigation, you will subject fresh, washed beetroot discs to different temperatures to investigate the effect of temperature on the permeability of the plasma membrane. While this was a 9% decrease; it was still an alarmingly high rate.
The purpose is to better understand how and why membranes use certain types of passive or active processes to move solutes and water across its membrane. Describe one way in which osmosis is similar to simple diffusion; describe one way in which it is different. To do this successfully I will need to alter the surface area of the beetroot cells accurately and then. There was also a pressure change in the left beaker with the Albumin solute using all four of the membranes. This data also shows that the water and glucose solution moved out of the dialysis bag because water molecules. Explain why the rate increased.