The rate of enzyme reactions Essay Example for Free

The rate of enzyme reactions Essay Concentration- This affects the rate of this reaction because if there is more pepsin molecules within the mixture then there is more chance of collisions between pepsin and albumen molecules, which in turn increases the chance of the active site slotting on to the enzyme. Temperature- this affects the rate of reaction because different enzymes work best at different temperatures with the usual temperature being37. 2i c. If the temperature varies too much then the enzyme will not work to its full potential. As the temperature rises the enzymes begin to denature (deform so active site does not fit enzyme). The changes caused by denaturing are usually reversible but if they are too extreme then the changes are irreversible. pH- the pH affects the rate of reaction because the enzymes all work best at specific pHs depending on where they are used. Prediction- I predict that as the concentration increases so will the rate of reaction, I believe this because as the concentration increases the number of pepsin particles will increase making the chance of a collision and the active site slotting on to the enzyme. Scientific Theory- In this experiment our aim is to test the rate of reaction under certain conditions. Enzymes are biological catalysts, i. e. they speed up a reaction without being used up. Enzymes work best at specific temperature and pHs. They work best at 37. 2i c and depending on where the enzymes work different pHs. Pepsin the enzyme we are testing works best at pH 2. Each enzyme uses a lock and key system meaning they fit on the substance they are meant to break down and only that substance. Some examples of enzymes and its substrate are: Proteins- Protease Carbohydrates- Carbohydrase. Where the enzyme latches onto its substrate the area is called the active site. Safety- For safety in our experiment we will put goggles on when pouring acid so we do not get acid in our eyes. Fair Test- In our test the independent (changeable) variable we chose was the concentration of the acid. Our dependant (measured) variable is the time taken for the pepsin to break down the albumen. Therefore each time we must use the same amount of acid to keep the conditions the same. We must also keep the total volume of liquid the same, along with the amount of albumen each concentration is reacting on. Equipment- Test tube rack Hydrochloric acid Pepsin Albumen Water Boiling tube. Measuring Cylinder Stopwatch Water Bath Range Repeat- In our experiment we will use different concentrations to get a wide spread of results showing the difference in the rate of reaction with different concentrations. Here are the concentrations we will use and ho we made them- Concentration (%) Water (ml) Pepsin (ml) Albumen (ml) Hydrochloric Acid (ml)Â   In the experiment because there is a high chance of error we will repeat each concentration three times and take an average. Method- 1. Gather specified equipment, 2. Put 12 test tubes in test tube rack. 3. First put the required amount of acid in test tube, then put in the pepsin, then the water and when in a water bath bringing the temperature to 35i c then finally add the albumen. 4. Time how long it takes for the solution to clear completely. 5. Repeat each experiment three times. Results- Concentration Pepsin (%) Time for albumen to clear (secs) Rate of reaction (secs) Analysis- From my results and graph I can see a pattern, as the concentration increases so does the rate of reaction. My graph shows a curved line of best fit, which in the case of my results shows that as the concentration increases the rate of reaction does increase but the rate between each concentration gets lower as the concentrations rise. This pattern happens because although they may be a larger amount of pepsin molecules only one pepsin molecule can break each albumen molecule down. Eventually if the concentration is increased too much then it would have an adverse effect on the rate of reaction because they would be too many pepsin molecules colliding, reducing the amount latching onto albumen molecules so the rate would decrease. To work out the rate of reaction I did 1/t. In this equation t is the average time and then I multiplied it by 100 because the numbers were too small (0. 0s). My prediction was correct as the rate of reaction increases when the concentration is increased. Evaluation- In our experiment I believe I did quite well, because we have a nice curve on our graph and my prediction was justified. In our experiment the point which looks most like an anomaly is at 30%. I think this as it looks to be a bit low to go with our line of best fit. In our experiment I think that some of our results are wrong because we did not have the enzymes at the right temperature. To improve our experiment we could use light gates to see exactly when the albumen goes clear and we could keep all the enzymes and acids in a water bath so they are all at the same temperature. Our anomaly is about 0. 25secs from the line of best fit, which would make it around 6. 25secs. Extension In an extension I would test the effect of temperature on the rate of reaction. I predict that the enzyme will work best at around 40i c and as you move away from that temperature the reaction would slow. Range and Repeat- I will repeat each temperature three times and find the average just in case of a mistake. I will measure the temperature from 10i 50i in 10i intervals. Method- 1. Gather Chemicals etc. 2. Put each chemical in a water bath at specified temperature (10, 20, 30, 40, 50) 3. Get 15 test tubes. 4. When at specified temperature first put the required amount of acid in test tube, then put in the pepsin, then the water and finally the albumen. 5. Start timer. 6. When cleared stop timer. 7. Repeat three times. Karl Long Biology Coursework 1 Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section. r

Avarice In America :: essays research papers

Avarice In America When the topic of American economics arises, the infamous Robber Barons of the 19th Century often springs to mind. They are often glorified as "Captains of Industry" for their money making strategies and enterprising methods. Those who hold this view probably do not know the evils of the laissez-faire capitalism in which the Robber Barons believed and participated. They wanted an unrestricted system of economics so that they could amass as much money as they could to out do each other and control the power in society. They were not as glorious and generous as some people make them out to have been. In laissez-faire capitalism, there are no restrictions on business so the enterprising capitalists were able to obtain monopolies by combining with other companies or simply buying them out. By doing this, the owners could raise the price of their goods or services to an intolerable amount so that they could gain even more money. This often put the common working people out of a job because the owners could get children and poor European and Asian immigrants to do the same menial factory jobs for pennies a day. This angered the Unions of America because their livelihood depended on the American working class. The Unions then persuaded the government to regulate the business giants and control the amount of money the companies could take in by disallowing monopolies and child labor. The "Kings of Capitalism" disregarded the impact their actions had on the lives of the working class men and their families. Many went hungry because of the lack of jobs available and were f orced to go into debt to the companies that was impossible to be repaid. The Robber Barons would do almost anything to gain more money and more power even putting hard working people out of their houses. It is often said that money is the root of all evil. The Robber Barons of the late 19th century proved this theory without fail. They showed that greed can overtake morals if the conditions are right. It is very evident that the Robber Barons had no qualms about ruining the lives of the people that worked for them and of society in general.

Suicide Bombing On The National Front Essay

Suicide bombing in Pakistan started after 9/11. Today Pakistan is the biggest victim of terrorism. After 9/11 incident, Pakistan supported the war on terror in Afghanistan. That war effected Pakistan very much. As border was not sealed so most of the Talibans ran away from Afghanistan to Pakistan. They were given shelter by the people of tribal areas of Pakistan because of their tradition of hospitality and clan bonding. As already Afghans were in refugee camps in Pakistan, so it was difficult to differentiate Talibans and Afghan refugees. Pakistan became a target as we found friends in Taliban’s enemy. Suicide bombing started in Pakistan. Initially, only the security forces were targeted but now even the common public is not spared. The war has spread to every nook and corner of Pakistan. First suicide attack in Pakistan was done in Islamabad in 1995. A truck full of explosives entered the Egyptian embassy and 14 people were killed. After investigation it was found out that bomber was Egyptian. Second suicide bombing was in Karachi. French engineers were attacked outside Sheraton Hotel in May 2002. In this attack 14 people were killed in which 11 were French engineers. Another attack in June 2002 was done outside American embassy. In 2003 President General Musharraf was targeted. In 2004 there were five suicide attacks including one attack on Prime Minister. In 2005 only 2 suicide attacks occurred. In 2006 suicide bombing again started to increase as there were 6 suicide attacks in which American embassy and Pakistan security forces were also targeted. In2007 these attacks were increased and total suicide attacks were done. In these attacks was on Former Prime Minister on Benazir Bhutto. In 2008 59 suicide attacks were done. In year 2009 till November 19, 70 suicide attacks were done. During Afghan jihad against Russia, America and Pakistan joined hands to fight it together. After the war, the U.S.A left the region in distress and civil war started in Afghanistan. The idea to use religion as a  tool to convince people to fight this war and organizing private militias resulted in destruction of Afghanistan after the war. It did not stop there. Pakistan continued on using religion as a tool and helped Taliban to form a government in Afghanistan. The whole episode of Al-Qaeda taking refuge in Afghanistan and 9/11 attack gave rise to a new fear. Previously, the whole world had their eyes closed to this Frankenstein they themselves created. Suddenly there was a hue and cry everywhere. Islam was said to be the threat to the whole world. Muslim bashing started happening and things got from bad to worse. America got dragged into this war and Pakistan along with it. Now after fighting it for this long, there seems no going back. There is no victory in sight and it cannot last forever. So it is a confusion which has found no solution. CAUSES OF SUICIDE BOMBING IN PAKISTAN One reason of suicide bombing in Pakistan is a tradition of Pushtoons called† badal†(revenge). This is the tradition according to which if a person of its tribe is killed by the person from other tribe then revenge is being taken from the killer tribe and that revenge is called badal. So similar to this happened in Afghanistan and tribal areas of Pakistan. People of those tribes were killed by American and Pakistani army. So reply to that they started targeting the check posts of army but later on they changed their target and now their target is innocent public of Pakistan. They considered it their right to kill the people in order to take revenge. Another reason of suicide bombing is American involvement in Pakistan. Pashtoons have got a history that they do not allow the foreign forces to occupy their land. American involvement in Pakistan is also not liked by Pushtoons and Taliban of Afghanistan and Tribal areas. Taliban has targeted Pakistan for their commitment to America. America’s drone attacks within Pakistan territory is one of the reasons for the increase in suicide attacks. Bajaur incident and Lal Masjid operation has helped Taliban by providing them new recruits for suicide bombing. In both incidents innocent students were killed. In retaliation there have been a lot of suicide  attacks in Pakistan for the last three years. American invasion of Islamic countries has contributed a lot to the common hatred in the Muslim world. Economic bondage was already there and then war was imposed on independent and sovereign countries. The feeling of resentment giving rise to Al-Qaeda and their extreme philosophies did not help the situation. Palestine, Iraq, Kashmir, Chechnya, Bosnia and Kosovo are all examples of Muslim occupied territories. Things were fine for the western world as long as there was no organized retaliation. It was bound to happen someday and it did happen. The result is that the world is very unsafe today and there is a lot of hatred which can result in a clash of civilizations. Injustice is one of the foremost factors that breed terrorism. When the grievances of the people are not redressed they resort to violent actions. So this is the case with Pakistan where timely justice has always been a far cry. Hence, the delayed justice is working as incentive for victims and dragging them to the swamp of terrorist organisations. Illiteracy is the root causes of extremism and terrorism. More than one in five men aged 15 to 24 unable to read or write, and only one in 20 is in tertiary education. such a high illiteracy rate has made Pakistan vulnerable to terrorism. furthermore, technical and vocational education, and adult literacy, are especially important but unfortunately have been neglected the most in Baluchistan, Khyber Pukhtunkhwa and the Tribal Areas. Illiteracy and lack of skills provide fertile ground for those who wish to recruit young men and women to their cause, especially when significant monetary payments are attached. Regarding poverty, it is also an incubating cause of terrorism. And it is said that â€Å"a hungry man is an angry man.† Notably, majority of people in Pakistan are living below poverty line. While especially for the youngsters, unemployment has made the matter worse. In these adverse circumstances, some people go to the level of extremism and even commit suicide. These are the people whose services are hired by the terrorist  groups and they become easy prey to terrorism. Food insecurity is also linked with militancy and violence. When people remain unable to afford food and cannot meet their basic needs civil strife grows. A report by the Islamabad-based Sustainable Development Policy Institute The highest levels of food insecurity, for instance, exist in the Federally Administered Tribal Areas, according to the report, where 67.7 per cent of the people are insecure. The next highest level is in Baluchistan, with food insecurity at 61.2 per cent, and then in Khyber-Pukhtunkhwa, 56.2 per cent. In Pakistan some extremist forces are exploiting the feelings of lower and lower middle class food insecure people. They are motivating their unemployed youth to commit heinous crimes such as suicide attacks against innocent people. REMEDIES In view of the root causes described in above paragraphs, the possible remedies could include: †¢ To begin with, a national commission needs to be set up, which identifies the fault lines and the root causes of the rise of extremism in Pakistan taking into consideration the post-Nine-Eleven developments. †¢ It should also take up the question of reforming the madrassas. The heads of all the major religious groups should be contacted and engaged to explore short-term and long-term solutions. †¢ Our universities and research institutes should take up the intellectual task of re-interpreting the Islamic injunctions in the light of modern knowledge and 21st century challenges (with emphasis on social justice). †¢ The government must improve its performance. Bad governance and corruption have lowered its credibility and clout, †¢ Parliament must debate Pakistan’s present relationship with the US, with  particular reference to the American war in Afghanistan and operations in Pakistan. †¢ Our government should make efforts to develop sector. Without any doubt, these efforts will play a crucial role not only in providing employment to the millions of people but will also eliminate poverty in the country. †¢ Pakistan’s government should particularly emphasise the need of technical education by promoting it. In this respect, more institutes should be opened in order to promote technical education. †¢ It is mentionable that there are two types of terrorists, extremists and moderates. In order to cope with terrorism, our government should neutralise the moderate terrorists through reconciliation by offering them general pardon and asking them to renounce terrorism. Even extremist insurgents can be offered mediation. Nevertheless, those militants who reject the offer could be fought through military operations. †¢ Nonetheless, for their on global and regional interests, US-led western allies must not only increase the military and economic aid of Pakistan but also provide direct market access to Pak products on zero rate duty to help stabilise the country’s bleak economy in the wake of the war against terror. †¢ As Pakistan has been successfully coping with the menace of terrorism, US-led some western countries including India should also give up their propaganda campaign against Islamabad and blame game against its intelligence agency ISI. †¢ US should help in resolving the Kashmir dispute to deal with the problem of militancy in the region. †¢ In order to fight terrorism, Pakistan’s media should play a key role. It must point out the criminal activities of the militants like hostage-taking, killing of the innocent people? torching the government buildings including girl schools and car-snatching. It should also indicate that Islam is a  religion of peace and does not allow suicide attacks. †¢ As Pakistan is already facing various crises of grave nature in wake of terrorism, so our politicians must stop manipulating the same for their own self-interests. By setting aside their differences and by showing power of tolerance, both our rulers and opposition parties need to act upon a policy of national reconciliation to cope with the problem of terrorism and to stand before external pressure. †¢ Finally, our politicians, general masses and security forces must show a strong sense of unity to fight terrorism. CONCLUSION Pakistan is a peace loving nation and playing its important role in combating terror. Recognition of efforts to fight menace of terrorism and sacrifices rendered thereof are testimony to the commitment and resolve to bring peace in the region. Unfortunately sometimes its commitment is doubted by some of its allies. Mistrust can lead to diversion of efforts, which will not be beneficial to common objective of peace in the region. Pakistan is a responsible nation; fully capable of defending its territorial integrity. Pakistan has singularly committed large forces to combat menace of terrorism more than any other country. No foreign troops are either present or deployed on Pakistan soil. All citizens of Pakistan must propagate moderate vibrant culture of Pakistan to promote good will of world community and shun misconstrued beliefs. Attacks on security forces personnel are executed at the sponsorship of hostile intelligence agencies. Such anti state elements must be singled out and brought to lime light to defeat evil agendas of our enemies. Pakistan has sacrificed the most in the ongoing war on terror; criticizing Pakistan’s efforts at national/international forum will be counter-productive to the overall objectives of war on terror.

A Bible Study, My Passage Comes From Matthew 8 5-13 Essay

Passage For this Bible study, my passage comes from Matthew 8:5-13. It is the story of the Roman Centurion with the servant who was very sick. This is the Centurion whom Jesus said had the greatest faith in all of Israel. Translation Comparison I read the passage in three different version of the Bible. They were New English Translation (NET), New King James Version (NKJV), and Good News Translation (GNT). A first difference I noticed in the different translations was that in verse 5, in the New English Translation, it says a centurion came to him â€Å"asking† for help while the other version said that he â€Å"pleaded† and â€Å"begged† with Jesus. Also in verse 6, in the Good News Translation, the centurion calls Jesus â€Å"Sir† while in the other translations, he calls Jesus â€Å"Lord†. The rest of these verses only had minor wording differences. Context Immediate Context The Immediate context of the story helps to show us that Jesus is on a journey, before this passage in Matthew 5:1 he begins teaching great multitudes on a unnamed mountain. When he comes down from the mountain (Matthew 8:1) the multitudes are still following him as he cleanses a leper (Matthew 8:2-4) After the story of the Centurion, these multitudes of people follow Jesus around as he heals peters mother-in-law (Matthew 8:14-17) and challenges a few people who profess that they want to follow him (Matthew 8:18-22). until he gave orders to sail to the other side of the lake with his disciples. This is when Jesus calms aShow MoreRelatedThe Significance Of The Identity Of Immanuel1397 Words   |  6 PagesDavidic Kingdom without the corrupt King Ahaz. The meaning of almah and the use of text by both Isiah 7 and Matthew 1:23 will additionally be explored by providing theological documentation to the true meaning. 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