Ap Bio Lab One: Osmosis and Diffusion

Meghann Kiphart AP Biology Lab Report Number One Mrs. Irvine Introduction: Because all molecules have kinetic energy and are constantly in motion cells go through a process called diffusion. Diffusion is the movement if molecules from an area of higher concentration to and area of lower concentration. This process with continue to occur until an equilibrium is reached. Osmosis is a different and unique kind of diffusion. Osmosis is the diffusion of water through a permeable membrane. The phrase â€Å"permeable membrane† means that the membrane will only allow specific molecules through such a water or oxygen.In Osmosis water will travel from an area of higher water potential or an area of lower water potential. Hypothesis: I think that in this lab, osmosis and diffusion will occur between the solutions of different concentrations until a equilibrium is reached and there is no movement of water. Materials: EXERCISE 1A: Diffusion The materials include a 30-cm piece of 2. 5-cm di alysis tubing, 15-mL of the 15% glucose/1% starch solution, 250-mL beaker, distilled water, 4-mL Lugol’s solution, and string. EXERCISE 1B: Osmosis The materials used include 25-mL of these solutions: distilled water, 0. M sucrose, 0. 4M sucrose, 0. 6M sucrose, 0. 8M sucrose, and 1. 0M sucrose, scissors, string, a balance, six 250-mL cups, and six 30cm strips of dialysis tubing. EXERCISE 1C: Water Potential The materials that were used included 50mL of distilled water, 0. 2M sucrose, 0. 4M sucrose, 0. 6M sucrose, 0. 8M sucrose, and 1. 0M sucrose, six 250mL cups with lids, 4 potato cores for each cup, a balance, and paper towel. EXERCISE 1D: Calculation of Water Potential from Experimental Data This exercise required a calculator and a pencil. Procedure: EXERCISE 1A:Soak the dialysis tubing in water before you start the experiment. Tie off one end of the tubing to form a bag like structure. Through the open end of the bad, place the starch solution in to the bag. Tie off the o ther end of the bag to secure the substance inside. Make sure to record the color of the solution in Table 1. 1. Next you’re going to text the starch solution for the presence of glucose. Record the results in Table 1. 1. Fill a 250ml cup about 2/3 of the way full with distilled water. Add 4ml of Lugol’s solution into the distilled water. Record the color of the solution in the Table 1. . Put the bag in the cup full of the solution. Allow the bag and cup to stand over night. The next day record the final color of the solution in Table 1. 1. Finally test the liquid in the cup and in the bag for the presence of glucose. Record the final results in Table 1. 1. EXERCISE 1B: Get six strips of presoaked dialysis tubing and create a bag like was shown in exercise 1A. Pour 25mL of the six solutions into each of the six bags. Tie off the other end of the bags. Rinse each bag gently with distilled water and dry the outside of the bag with a paper towel.Weigh each bag and record the results in Table 1. 2. Put each of the six bags into the cups with the six different solutions. Let stand over night. The next day remove the bags from the water and carefully dry the bags with paper towel. Weigh each bag and record them in Table 1. 2. Gather the other lab group’s data to be able to complete Table 1. 3. EXERCISE 1C: Pour 50mL of the solutions into a labeled 250mL cups. Using a cork borer, cut the potato into 24 cylinders. (4 potato cores x 6 cups = 24 potato cores altogether) weigh the mass of each set of 4 potato cores.Record the data in Table 1. 4. Put 4 potato cores into each solution cup. Cover the cup with a lid to prevent evaporation. Let stand overnight. Remove cores from the cup and dry them with a paper towel. Then determine there combined weigh in groups of 4 (from the same cup). Record the results in Table 1. 4. Calculate the percentages changes in mass. Collect the class data and determine the class change in mass. EXPERIMENT 1D: Determine the solute, pressure, and the water potential of the sucrose solution. Then, graph the information that is given about the zucchini cores. Questions:EXPERIMENT 1A: 1. Which substances are entering the bag and which are leaving the bag? What evidence supports the answer? Distilled water and IKI are leaving and entering. Glucose is able to leave the bag. 2. Explain the results that were obtained. Include the concentration differences and membrane pore size in the discussion. Glucose and small molecules were able to move through the pores. Water and IKI moved from high to low concentration. 3. How could this experiment be modified so that quantitative data could be collected to show that water diffused into the dialysis bag?You could mass the bag before and after it is placed into the solution. 4. Based on your observations, rank the following by relative size, beginning with the smallest: glucose molecules, water molecules, IKI molecules, membrane pores, and starch molecules. Water molec ules, IKI molecules, Glucose molecules, membrane pores, and starch molecules. 5. what results would you expect if the experiment started with a glucose and IKI solution inside the bag and only starch and water outside? The glucose and IKI would move out of the bag and turn the starch and water solution purple/ blue.The starch couldn’t move inside the bag because its molecules are too big to pass through the membrane of the tubing. EXERCISE 1B: 1. Explain the relationship between the change in mass and the molarity of sucrose within the dialysis bags. The solute in hypertonic and water will move into the bag. As the molarity increases the water moves into the bag. 2. Predict what would happen to the mass of each bag in the experiment of all the bags were places in a 0. 4M sucrose solution instead of distilled water. With the 0. 2M bag, the water would move out. With the 0. M bag, there will be no net movement of water because the solutions reach equilibrium. With the 0. 6M-1. 0M bags the water would move into the bags. 3. Why did you calculate the percent change in mass rather then simply using the change in mass? This was calculated because each group began with different initial masses and we would have different data. All the groups need consistent data. 4. A dialysis bag is filled with distilled water and then places in a sucrose solution. The bag’s initial mass is 20g and its final mass is 18g. Calculate the percent change of mass, showing your calculations. 18-20)/20) x 100 = 10% 5. The sucrose solution in the cup would have been hypotonic to the distilled water in the bag. EXPERIMENT 1D 1. If the potato core is allowed to dehydrate by sitting in the open air, would the water potential of the potato cells decrease or increase? Why? It would decrease because the water would leave the cells and cause the water potential to go down. 2. If a plant cell has a lower water potential then its surrounding environment and if pressure is equal to zero, is the cell hypertonic or hypotonic to its environment?Will the cell gain water or lose water? It is hypotonic and it will gain water. 3. The cup is open to the atmosphere, what is the pressure potential of the system? The pressure potential is zero. 4. Where is the greatest water potential? In the dialysis bag. 5. Water will diffuse out of the bag. Why? It is because the water moves from the area of high water potential to an area of lower water potential. 6. What effect does adding solute have on the solute potential component of the solution? Why? It makes it more negative 7.Consider what would happen to a red blood sell placed in distilled water: A) which would have the higher concentration of water molecules? Distilled Water B) which would have the higher water potential? Distilled Water C) what would happen to the red blood cell? Why? It would leak, because it would take to much water. Conclusion: In Exercise 1A the data collected helped tell which molecules can and can not m ove across a cell membrane. IKI, we know because of its color change, was able to move across a membrane. Starch, although, is too large to move across a membrane.Glucose was able to move freely, along with the water, across the cell membrane. In 1B, it was proven that water moves faster across the cell membrane then sucrose. The water moved to help reach equilibrium between the 2 solutions. The sucrose molecules are too big to move across the membrane as fast as water can. In experiment 1C showed that the potatoes contained sucrose. The sucrose in the potato raised the solute potential, which lowered the water potential. The cup of distilled water had a high water potential water moves down the concentration gradient, causing the potato cores to take on water.

Due Diligence

â€Å"Due  diligence† is a somewhat technical phrase used to describe a range of assignments, legal obligations, reports and investigations which take place in business, manufacturing and law. Its most frequently heard version is the one pertaining to business, where â€Å"duediligence† refers to the steps taken by venture capitalists before investing a round of capital in a startup, the ongoing investigation as to how the funds are being distributed, or the precautionary steps taken by a larger company in deciding to acquire a smaller company. Sometimes the phrase is referred to as a capitalized proper noun:  Due  Diligence. The precise definition of â€Å"due  diligence† varies between firms and organizations. In manufacturing for example, certain environmental requirements must be met, which are verified in an Environmental Site Assessment called a â€Å"due  diligence  report†. It consists of a checklist of specifications and sections for open commentary. Ads by Google |IT Due Diligence Experts |Information & Communications Technology Due Diligence. Munich | | |www. oach. de | |Due Diligence Checklist |Industry proven 600+ pt checklist available for immediate download | | |www. birds-eye. net | |Due Diligence |Worldwide offices Know-how, experience & resources | | |i-factanalysis. om/due_diligence | |M&A Cross-Border |Mergers & Acquisitions Business Sales, Invest in Europe | | |www. eleusis. eu | |Free Trading Webinar |Learn how to use technical analysis to make better security trades. | | |www . equis. com | In venture capitalism,  due  diligence  involves looking into the past and present of the people and structure of a company requesting  venture funding. For instance, venture capitalists are wary of investing in companies that lack people with credentials or a proven track record. Depending on the overall level of caution in the investment environment at the time, a  duediligence  investigation may be more or less stringent. Typically a  venture capital  firm will have a dozen or more investigators whose task is to research specific details of the personal history of people in the company. With the Internet, researching a person's past associations and experience has never been easier, much to the delight of investment communities. Of course,  due  diligence  is not a panacea against investment failures. Even a company made up of well-educated high achievers can falter  due  to unpredictable market conditions, unforeseen competition, or technical setbacks. Due  diligence  generally refers to the background checks conducted after a venture partner has already made a decision about the company. Typically, partners will prefer to invest in companies led by people they already know are very trustworthy, and probably have been given funds in the past. In law,  due  diligence  refers to precautions that are supposed to be taken by a person or company in some context. For example, did the company thoroughly check their product beforehand to ensure it was non-toxic or was not a strangulation hazard? If they do not, and bad results come of their  negligence, they can be held criminally liable. Due Diligence â€Å"Due  diligence† is a somewhat technical phrase used to describe a range of assignments, legal obligations, reports and investigations which take place in business, manufacturing and law. Its most frequently heard version is the one pertaining to business, where â€Å"duediligence† refers to the steps taken by venture capitalists before investing a round of capital in a startup, the ongoing investigation as to how the funds are being distributed, or the precautionary steps taken by a larger company in deciding to acquire a smaller company. Sometimes the phrase is referred to as a capitalized proper noun:  Due  Diligence. The precise definition of â€Å"due  diligence† varies between firms and organizations. In manufacturing for example, certain environmental requirements must be met, which are verified in an Environmental Site Assessment called a â€Å"due  diligence  report†. It consists of a checklist of specifications and sections for open commentary. Ads by Google |IT Due Diligence Experts |Information & Communications Technology Due Diligence. Munich | | |www. oach. de | |Due Diligence Checklist |Industry proven 600+ pt checklist available for immediate download | | |www. birds-eye. net | |Due Diligence |Worldwide offices Know-how, experience & resources | | |i-factanalysis. om/due_diligence | |M&A Cross-Border |Mergers & Acquisitions Business Sales, Invest in Europe | | |www. eleusis. eu | |Free Trading Webinar |Learn how to use technical analysis to make better security trades. | | |www . equis. com | In venture capitalism,  due  diligence  involves looking into the past and present of the people and structure of a company requesting  venture funding. For instance, venture capitalists are wary of investing in companies that lack people with credentials or a proven track record. Depending on the overall level of caution in the investment environment at the time, a  duediligence  investigation may be more or less stringent. Typically a  venture capital  firm will have a dozen or more investigators whose task is to research specific details of the personal history of people in the company. With the Internet, researching a person's past associations and experience has never been easier, much to the delight of investment communities. Of course,  due  diligence  is not a panacea against investment failures. Even a company made up of well-educated high achievers can falter  due  to unpredictable market conditions, unforeseen competition, or technical setbacks. Due  diligence  generally refers to the background checks conducted after a venture partner has already made a decision about the company. Typically, partners will prefer to invest in companies led by people they already know are very trustworthy, and probably have been given funds in the past. In law,  due  diligence  refers to precautions that are supposed to be taken by a person or company in some context. For example, did the company thoroughly check their product beforehand to ensure it was non-toxic or was not a strangulation hazard? If they do not, and bad results come of their  negligence, they can be held criminally liable.

Sociology ( popular culture) Essay Example | Topics and Well Written Essays - 500 words

Sociology ( popular culture) - Essay Example 1)†. Of course the entertainment state is much larger that television itself and is essentially made up of what Hirsch (2000) calls cultural industries. These industries include television, films, news media and other influences on culture that define how a society shapes itself. The entertainment state can affect cultural values to the point that villains in the culture of one social order may be the heroes in another. For example, in some Islamic countries â€Å"Osama bin Laden’s now familiar smile beams out from posters and T-shirts dotted around the bus stops and markets (The Daily Times, 2003, Pg. 1)†. In American however, his picture may grace many dart boards. This is also a difference of ideology which is described by Johnson (2004, Pg. 587) as, â€Å"Popularly accepted ideas about the structure, the internal processes, and the world situation of the society†. Further, ideology includes ideas about the history of the society, revaluations of accepted facts as well as the values and goals which society has for itself. However, Johnson (2004) makes it clear that ideology is not a static object since it can change its particulars with time and may need constant reassurances from the institutes which maintain and control the social order. This maintenance and control of the ideology of a society creates hegemony. The hegemony may be created by the government in situations where the media is controlled by the state or it may be created by media mavens themselves. In America for example, the media controls most of the information and entertainment given to the public. As described by Henry (2007, Pg. 252), â€Å"Five gigantic entities: Time Warner, the Walt Disney Corporation, Rupert Murdoch News Corporation, Bertelsmann of Germany and Viacom† control most of whatever is heard and seen by the American public. Unsurprisingly, this media cartel has the same news and views to offer to the public while the voice of

Ecotourism Essay Example | Topics and Well Written Essays - 500 words

Ecotourism - Essay Example Both cultural and natural resources are affected by the pollution. Water supply, coral reefs heritage sites, and beaches are affected through overuse. Littering, traffic emissions, increased noise, and sewerage production are some of the disadvantages that come with high tourism activities. Tourists have, in recent times, become jaded with destinations which they have been traditionally visiting over the years, and the current trend is visiting the rarely visited destinations which they feel are exciting. These places include; the Antarctica, Easter Islands, Galapagos Island, the Siberian Tundra, the Borneo forest, Papua New Guinea and the Amazon Rainforest. These destinations offer the best sites for ecotourism and are big sources of income to the revenue authorities of the countries they are found in. However, the carbon emissions that occur in the process of getting access to these areas and the infrastructure required to cater for tourists impacts natural surroundings. In the Similan Islands and Great Barrier Reef, divers try by all means to be careful not to damage the natural setting. They however take too many learners to the important aquatic resources. The learners disturb the natural resources by damaging the corals and polluting the natural habitats. Tourists in National Parks in Africa use jeeps. In many instances, occupants of these jeeps litter the parks, which may lead to poisoning and deterioration of the park’s natural environment and disturbs the animals’ natural feeding patterns. Despite the money earned from tour charges in such parks, the disadvantage comes about when such pollution leads to reduced numbers of game animals due to effects of environmental deterioration that force animals to move away. Tourism also brings income when beaches are visited. There are, however, not enough resources to cater for the needs of all the visitors. In such cases, refuse disposal and

Personal Income Tax and Revenue Forecasting Assignment - 1

Personal Income Tax and Revenue Forecasting - Assignment Example The lower tax rates are expected to stimulate economic activity and to encourage business to move from the shadow to the official (taxpaying) economy, so some of the revenue loss will ultimately be recovered. The Ministry of Finance forecasts collections of 7,789,000 markka (MK) for 2001. Data on tax collections are reported on the following page. Based on the information provided, the ministry definitely needs to revise its 2001 forecast. This is because the pace of tax revenue being collected is not coinciding with its revenue forecasting, which is 7.8 million markka. Basically, at its best point, the tax revenue averaged about 1.2 million markka, at the end of 1999 and 2000. However, the data in 2001 shows a significant drop compared with the past three previous years when tax revenues were compared. This means that it will probably take about 20 more years or so until tax revenue reaches 7.8 million markka, because if it took 3 years to get to 1.2 million in revenue—one multiples 3 by 7 and one gets the number of approximately 21 years to create that amount of revenue. Of course, revenue could increase exponentially in years to come, thus making the target goal of 21 years achieved in a faster time period. However, the important point to remember is that there are several factors that go into how such data is arrived at in the first place. So, supposing that Vardar’s markka strengthens as time goes on and that more people are able to pay taxes due to the economy being stimulated and people being freed up to make more money—it is entirely possible that the economy will grow significantly before the 21-year window of economic growth is due. It depends on if people can get the jobs to provide for their families and support the economy. What factors might influence the patterns seen in the data include a variety of things. In former Soviet

The history of The High School Journal Research Paper

The history of The High School Journal - Research Paper Example This then led to the conventional schools that we currently known as public schools. It has also undergone a wave of racial and sexual mixes that has transformed the learning system. Originally, education suffered from segregation, racism and social class. Children from rich families were educated in some of the best private schools while those from poor families were left to toil in the public schools. Immigrants were also not allowed to freely engage in education and state funding rarely went to the development of schools in the predominant south. Women played an active role in advocating for reforms in the education system. The United States education system has developed from a place whereby there were few valuable skills imparted on adolescents as seen in progressivism. It has however undergone significant reforms over the years to cater for its multicultural population. These reforms have however been attributed to historical events that contributed to the present education system. I chose to analyze the History of the High School Journal which published in the first issue in 1910. The journal has been issued every year since then and is still being printed to date. This publication has been reviewed by several authors and continues to be the source of information on the advancements that are being made in the education sector. This period still had traces of the industrial revolution that had spilled over from the 19th century. It was a time of unprecedented economic growth at the height of industrial revolution. Many young people had engaged in jobs and very few were to be found in classrooms. Colleges and other institutions of higher learning had not yet been well established. Measures in secondary education were also still undergoing significant changes with school libraries still being advocated for to improve learning. This period was characterized by the great depression that started in 1929 and lasted the whole decade. There was limited

A short report of India's market for the UK Electrical Goods Trade Essay

A short report of India's market for the UK Electrical Goods Trade Association - Essay Example nomic performance prompted a change in the trade policy of the country; consequently, India introduced a new policy of deregulation, globalization, as well as privatization of its economy. India is a member of several multinational and regional trade organizations, which play a major role in her international trade. Some of these organizations include WTO, Asian-Pacific Economic Community (APEC), and the association of South-East Asia Nations (ASEAN) (Chan et al. 2006). In the past few years, the electronic industry in India has recorded high returns like never before. There are various factors, which have contributed to the demand of electronics in India. These factors include the improvement of the standards of living among the middle class in the country, and the fact that their disposable income has also increased considerably (Hill 2011). Moreover, the country has in the recent years taken some liberalization steps for instance reducing tariffs on imports, relaxing equity regulations as well as foreign exchange regulations, and last but not the list the banking policies have been refined to meet the needs of foreign and local market. The role of the Indian government cannot be ignored in boosting the electronic industry to where it is now (Banga 2006). More foreign investors have ventured in the electronic business in India following the increase in the demand for electronic in the country and the liberalization steps taken by the country has further created a conducive environment that is capable of sustaining an enduring high growth for the electronic industry. Several factors must be assessed prior to importing electronics to India. Before venturing into exporting electronic to India there is a need to carry out a PEST analysis to determine the factors that may affect an organization. The initials PEST is used to mean the social, economic, and Technological factors that might affect the business (Baruch & Budhwar 2006). Political environment: In the