Outline the roles of membrane at the surface of the cell The plasma membrane encloses the cell‚ defines it boundaries and maintains the essential differences between the cytosol and the extra-cellular environment. The separation of the internal and external environment maintains a constant internal environment which is essential for the cell to function efficiently. Membrane receptors can interact with specific molecules corresponding to stimuli such as hormones to generate a signal cascade which
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electrically excitable membrane changes its electric potential. In other words‚ how is the cell membrane excited? At the surface of the cell membrane‚ there are three classes of gated channels exist‚ chemically gated or ligand-gated channels‚ voltage-gated channels‚ and mechanically gated channels. Originally‚ at the resting membrane potential‚ most of the gated channels are closed. However‚ when these gated channels open‚ the movement of ions across the membrane will changes the membrane potential. In the
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35.Which is of the following would be likely to increase outdoor air pollution? a.Wide open landscapes transport pollutants. b.Hills and valleys increase the flow of air in valleys c.Higher temperatures decrease chemical reactions leading to more photochemical smog formation. d.FOC emissions from certain trees and plants can play a large role in creating photochemical smog. e.Temperature inversions can help to disperse pollutants. 36.Which of the following statements is true? a.Temperature
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Diffusion throughout the membranes Lab Partner(s): Alexis Clouting Date: 2/15/15 Abstract: In the content of the Module 2 we learned about Diffusion across cell membranes. We touched on the different types of cells and their functions. How things are transported in and out of cells. Learning about isotonic‚ hypertonic and even hypotonic solution. This is not my first time touching on this subject in my nursing career and I learned a way to remember what happens in the different solutions. This project
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At rest‚ a nerve cell maintains a difference in charge between the inside and the outside of the cell membrane. This difference in charge is continued by three factors. Firstly‚ in the cell membrane‚ there are sodium potassium ‘pumps’ crossing the membrane which are proteins that bring 2 potassium ions into the cell‚ for every 3 sodium ions it pumps out. As well as this‚ there are protein channels which allow potassium ions in the cell to flow out via facilitated diffusion. Potassium diffuses out
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Each enzyme has it optimum temperature range at which it functions at an optimum efficiency. In this experiment‚ Rennin might have an optimum temperature of 37 degrees Celsius as it is found in the stomachs of young mammals. As the temperature is increased‚ the rate of reaction (time for milk to curdle) will also increase until the optimum temperature is reached (37 degrees). After reaching this set point‚ the activity of the enzyme will gradually begin to decrease and the rate of reaction will
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The Rate of Diffusion in Different Temperatures Purpose: To see if the temperature of a solution will change the rate blue diffuses in it. This will be tested by timing how long it takes dye to diffuse in warm water‚ cold water‚ and room temperature water. Hypothesis: I think that the dye will diffuse at a faster rate in the warm water than in the cold water. I believe that the room temperature water will have the dye diffuse faster than the cold water but slower than the warm water. Variable:
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TYPE 1: IMMEDIATE TYPE 2: ANTIBODY MEDIATED Feature Known as anaphylactic HS Fast response (minutes) Disorders/ Reactions Athopy Clinical manifestation includes asthma‚ eczema‚ hay fever‚ food allergy Has family history with similar condition Show immediate wheal and flare skin reaction to allergen Strong hereditary linkage seen in human Autoimmune haemolytic anaemia Spontaneous/ induced by drugs Reacts to blood group Ag – produce Ab to self RBC Test: direct antiglobulin test
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Effect of varying Temperatures on Enzymatic Activity of Bacterial and Fungal Amylase and hydrolysis of Starch Abstract This experiment consisted of setting up a control group of starch in various temperature and then placing both fungal amylases and bacterial amylases in a mixture of starch and placing the solution of amylase and starch in various temperatures of water. After a certain amount of time- different amount of time needs to be used in order to have reliable results- iodine is added
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Ideal Temperature for junket Aim- To discover the optimum temperature for junket to solidify Hypothesis- That the optimum temperature will be between 35-40°C Independent variable- Temperature (10‚ 40‚ 60 degrees) Dependant variable- Time taken for Junket to set Control- 2 clearly marker test tubes will be placed under each temperature condition‚ one with junket and one without‚ to clear the complication that it might be the temperature that is reacting with the milk and solidifying it instead
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