Cell Transport Mechanisms and Permeability Essay Example for Free (#4)

Cell Transport Mechanisms and Permeability Essay Exercise1 Cell Transport Mechanisms and Permeability Name ____________________________________________________________ Lab Time/Date ______________________________ Activity 1 Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. * The size of the pores of the membrane * The size of the molecule diffusing through the membrane 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? * Because the pores of the membrane were not large enough * I predicted this correctly. 3. Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well did the results compare with your prediction? I predicted that only glucose would diffuse through it and was right. Albumin is too heavy to diffuse through that membrane. 4. Put the following in order from smallest to largest molecular weight: glucose, sodium chloride, albumin, and urea. NaCl, Urea, Glucose, Albumin Activity 2 Simulated Facilitated Diffusion 1. Explain one way in which facilitated diffusion is the same as simple diffusion and one way in which it differs. -Similar – They pass through the membrane without the use of ATP, they’re both forms of passive transport. -Different – The solutes in facilitated diffusion pass through a carrier protein while the solutes pass through the membrane in simple diffusion. 2.The larger value obtained when more glucose carriers were present corresponds to an increase in the rate of glucose transport. Explain why the rate increased. How well did the results compare with your prediction? Since there were more carrier proteins, more glucose could diffuse into the cell at one time which made the process go along much quicker. I predicted this correctly. 3.Explain your prediction for the effect Na+Cl− might have on glucose transport. In other words, explain why you picked the choice that you did. How well did the results compare with your prediction? I said that the rate of diffusion would decrease, which was wrong, because I figured that having the NaCl would equalize the concentration gradient and make the concentration gradient and make it a slower process. The rate actually remained unaffected because NaCl is not required for glucose in the simulation. Activity 3 Simulating Osmotic Pressure 1. Explain the effect that increasing the Na+Cl− concentration had on osmotic pressure and why it has this effect. How well did the results compare with your prediction? I predicted correctly in saying that the NaCl concentration would increase the pressure because they are directly related, meaning if one increased, that means the other one must have increased as well. 2. Describe one way in which osmosis is similar to simple diffusion and one way in which it is different. -Similar – Solutes can still pass through the membrane in both simple diffusion and osmosis. -Different – In diffusion, the particles go from high concentration regions to low concentration regions, while in osmosis it crosses from a region of low solute concentration to high solute concentration. 3.Solutes are sometimes measured in milliosmoles. Explain the statement, â€Å"Water chases milliosmoles.† Water follows the solutes (milliosmoles) into higher concentrated areas of solutes, me aning it was going against the concentration gradient and â€Å"chasing the milliosmoles.† 4.The conditions were 9 mM albumin in the left beaker and 10 mM glucose in the right beaker with the 200 MWCO membrane in place. Explain the results. How well did the results compare with your prediction? Keeping in mind the past activities, I predicted correctly before doing this activity. The glucose diffused through to the left beaker forming equilibrium, which created osmotic pressure on the left side. The albumin cannot fit through that membrane so it didn’t reach equilibrium. Activity 5 Simulating Active Transport 1. Describe the significance of using 9 mM sodium chloride inside the cell and 6 mM potassium chloride outside the cell, instead of other concentration ratios. Because the sodium-potassium pump needs a 3:2 ratio to function, meaning once the concentration of the KCl runs out then the NaCl cannot function either. 2. Explain why there was no sodium transport even though ATP was present. How well did the results compare with your prediction? I predicted wrong with this activity because I said that the Na+ would be maximally transported. I know now that although in the presence of ATP, the pump still cannot function without any K. 3. Explain why the addition of glucose carriers had no effect on sodium or potassium transport. How well did the results compare with your prediction? I also predicted incorrectly on this one because I did not realize that the glucose carriers don’t need ATP to function so they were still at the mercy of how much potassium there was in the sodium-potassium pump. I thought that there would be easier access into the cell for the Na and K cells. 4.Do you think glucose is being actively transported or transported by facilitated diffusion in this experiment? Explain your answer. Facilitated diffusion because it is moving with the concentration gradie nt and the glucose carriers don’t require ATP to transport the glucose. Cell Transport Mechanisms and Permeability. (2016, Apr 02).

Impearialism, colonialism. and globalization on how they affect the Essay

Impearialism, colonialism. and globalization on how they affect the middle east - Essay Example On the other hand, the democratization system has become a problem due to the influence of globalization. This is due to the clash of interest between the western industrialized nations and the state aboriginal affair (Alkadry 739). In the recent occurrences, most of the developed and decolonized have been caught up in the matrix of struggle for liberation and self-determination. Likewise, the countries of Middle East are furthering democracy and at the same time struggling to get self-determination in a postcolonial globalization context (Alkadry 739). Most of the countries in Middle East achieved their independence half a century ago. However, no single country in the region has a full-fledged democratic government. This is also evident in the wave of revolutions currently taking place in the region. Only few countries in the region that have made stride towards installing democratic institutions. These countries include Lebanon, Turkey, and Kuwait (Alkadry 740). The issue of self- determination is guided by two principles. They include national independence and freedom. In the Middle East, this has not been possible due to the threat of imperialism. This makes it difficult for the nations to move from a moment of national sovereignty and anti-social resistance to a moment of freedom and democratic governance (Alkadry 740). ... Algeria is one of the countries where imperialism was evident during the colonial period. It congest began in 1830. This occurred after French deployed powerful army in the region. The heavy military presence led to death of many Algerians. This helped France to acquire land in Algeria. This was followed by massive migration on settlers into Algeria to farm in the Algeria coastal plains (Women in World History 1). Most of the Algerians were employed in these farms as laborers. Moreover, France exercised control of public finances such as public works, education, and armed forces and security (Women in World History 1). However, there was armed resistance to the French rule based on tribes. The French armies in harsh means effectively subdued the rebellion. On the other hand, the colonial power was given voting power to elect representatives to the French legislature. Consequently, the colonial power possessed immense power and this helped in gaining enormous wealth. Additionally, mos t of the properties owned by the locals were confiscated both communal and private. In the year that followed, France exercised political, economic, and social dominance over Algeria and its inhabitants (Women in World History 1). This shows that imperialism helped France to develop their own ambitions and influenced wider developments. Imperialism affected countries in different ways. Imperialism helped in reviving the transport sector. This occurred as the colonizing country built roads and railways. This was meant to enhance easy movement for acquisition of raw materials. Moreover, there is an introduction of new technology, education, and improved health care (Hodgepodge 1). On the other hand, imperialism leads to negative effects. First, there was a lack of

Mao's propaganda with arts Essay Example | Topics and Well Written Essays - 2000 words

Mao's propaganda with arts - Essay Example Art propaganda was based on the cult of Mao and his unique vision of communist China. As a charismatic leader, he directed propaganda to mass publics and mass media amplified political and social messages. Mao's art propaganda was a product of the more egalitarian, participant forces that emerged in the communist China (Cheek 82). Unlike members of mass cultures, who were almost wholly dependent on their leaders for propaganda, members of the popular culture have gained the ability to initiate messages as well as respond to them. The aim of art propaganda was to remold the individual (Brady 98). Art propaganda was a part of new mass culture created by Mao. On the domestic front, the new government introduced a system of rationing cards to purchase food, clothing, and other scarce commodities essential for everyday living. Curbing and eliminating social ills also loomed large on the agenda, prompting government officials to crack down on black marketeering, religion, and the sale of opium (Cushing and Tompkins 43). In the case of opium, the government imposed stiff criminal penalties, including the execution of suppliers and dealers. By 1951 addiction to opium had fallen off sharply, enabling the government to focus more on the social consequences of drug abuse and on educational and rehabilitation programs for victims and users. The most extreme of this art propaganda was that which went under the name of the new republic and new social order established by Mao (Cushing and Tompkins 45). Art propaganda was one of the most effective and simple ways to influence Chinese society and form national ideals and values. The propaganda was grounded in the needs of totalitarian society to create and exploit mass cultures. Art propaganda flowed from the leader, Mao, to the led, from a few to many, not from many to a few (Cheek 81). Posters and wallpapers were used to educate the peasants in the political process by making them aware of their political power and encouraging them to seize the land and kill their landlords. Following Knight (2002): "He [Mao] recognized and admired the revolutionary potential of China's peasants that had resulted from centuries of feudal exploitation and oppression. He recognised, too, that conditions were deteriorating in the countryside due to the economic effects of imperialism and the political instability resulting from the collapse of the Qing dynasty and the division of China between hostile warlords" (29). In fact, estimates of the number of counterrevolutionaries executed during the early period of Mao's domestic revolution range between 1 and 3 million people, figures that raised the specter of a government-sanctioned reign of terror (Cheek 80). Emotional appeal was made in every major section of art propaganda, and even legal arguments were fundamentally based upon emotionalism. The effort was constantly made to arouse fear and hate of the capitalists, and pity, love, and admiration for the workers and communist regime. A most important phase of this technique was the practice of exploiting idealism. The Chinese