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Membrane Essay Examples

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Cell Transport Mechanisms and Permeability

Simple Diffusion 1. The following refer to Activity 1: Simulating Dialysis (Simple Diffusion). Which solute(s) were able to pass through the 20 MWCO membrane? None of them did According to your results, which solute had the highest molecular weight? Albumin Which solute displayed the highest rate of diffusion through the 200 MWCO membrane? Na+CI Using…

Origin of Rice

A major component of plants that are starchy in nature, the amyloplast are organelles that store starch. They are classified as plastids, and are also known as starch grains. They are responsible for the conversion of starch into sugar, that gives the starchy plants and tubers energy. Function: Synthesis and storage of starch granules Cell…

The effect of alcohol concentration on the cell membrane

Abstract: In this experiment I found out that as the concentration of the alcohol was increased so did the colour intensity of the solution. This is because the higher concentration of ethanol, results in more damage done to the cell membrane, resulting in leakage of red pigment from the cell. If the membrane is damaged…

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The effects of osmosis

Introduction: Osmosis is a movement of water across a semi-permeable membrane. This may only happen when there is a difference in concentration between the two sides of the membrane. The water moves from low concentrations to high concentrations. That is because the low concentrated area tries to dilute the opposite via osmosis. The effects osmosis…

Action Potential and Receptor Olfactory Receptor

You scored 100% by answering 4 out of 4 questions correctly. 1. Assuming that the resting potential of a sensory neuron is -70 mV, which of the following represents a depolarization? You correctly answered: c. a change to -60 mV 2. Which of the following is a sensory modality (type of sense)? You correctly answered:…

Action Potential and Receptor Olfactory Receptor

You scored 100% by answering 4 out of 4 questions correctly. 1. A very intense stimulus can sometimes stimulate sensory neurons that have evolved for a different modality. Thus, with a blow to the eye, one “sees stars. ” In this example the photoreceptors in the eye are responding to You correctly answered: c. intense…

Osmosis and Selectively Permeable Membrane

Introduction: Molecules have kinetic energy. This causes the molecules of the cell to move around and bump into each other. Osmosis is a special kind of diffusion where water moves through a selectively permeable membrane (a membrane that only allows certain molecules to diffuse though). Diffusion or osmosis occurs until dynamic equilibrium has been reached….

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