Osmosis essay

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osmosis essay

Diffusion and osmosis lab report - choose Expert and

However this is occurs only for a certain period until all the active sites are saturated with substrates. Therefore an increase in substrate concentration will not result in a increase in the rate of reaction. Carbohydrates such as glucose and sucrose are too soluble and reactive to be stored as they come as they would present osmotic problems and so they are stored in much more complex, insoluble structures known as polysaccharides. Polysaccharides are macromolecules formed by the joining of many monosaccharides together in condensation reactions. There can be more than 3000 repeating units in a chain, joined by glycosidic bonds, forming many complicated structures, one being starch. Starch is a polymer of alpha glucose, where the hydroxyl group is below the ring, and is made up of 30 amylose and 70 amylopectin.

Osmosis essay - select Expert and Cheap Paper Writing

I must ensure that temperature is hungarian kept constant throughout. Ph, another factor which can affect enzymes. Enzymes also have an optimum pH which is pH enzymes work best. Changing the pH can change the tertiary structure due to the number of h ion in an acid or the oh- ions in an alkali. These ions disrupt the hydrogen and ionic bonds between -nh2 and -cooh. This will cause the tertiary structure to break down and changing the active london site in the process. Once again, the substrate will no longer be able to bind with the active site, hence no substrate enzyme complex will form. I intend to use a buffer solution which will resist any changes. Substrate concentration, increasing substrate concentration increases enzyme activity as they are more molecules to occupy the active site, thus a faster reaction. If more enzyme substrate complex forms then more co2 will be produced.

Temperature, an increase in temperature will cause an increase in the rate of reaction because both the enzyme resumes particles and substrate particles have gained kinetic energy. This will result in the particles to move faster, thus increasing collision frequency and the numbers of successful collisions as the particles have the required activation energy. If the temperature rises above the optimum temperature then the enzymes can become denatured. This happens because the enzyme molecule vibrates more causing the weak hydrogen bonds (holding the 3D structure of the enzyme together) to break. This eventually leads to the shape of the active site being altered. Consequently, the substrate will not be able to bind with the substrate as the shape of the active site is no longer complementary so the substrate enzyme complex can not form. This is important in my experiment because if the yeast (enzyme) was to become denatured then it would not be able to bind with the substrate (e.g. Glucose) and the reaction would not be catalysed, preventing any co2 from being formed.

osmosis essay

Osmosis, essay - 880 Words

The process is called because the final terminal electron acceptor is oxygen which picks up the electrons from the chain and the h ion from the matrix to form H20 as a waste product. This reaction business is catalysed by the enzyme cytochrome Oxidase. For every nadh which enters the chain and is oxidised by nadh dehydrogenase, 3 atp are produced. For each fadh that enters the chain, 2 molecules of atp are made. Enzymes, enzymes are proteins that can effectively increase the rate of a reaction by lowering the required energy (activation energy) needed in order for the reaction to occur. Enzymes have a tertiary structure which decides the shape of the active site. The substrate must be specific to the active site because if they were not complementary to each other, then the substrate can no longer bind to the active site, thus the enzyme substrate complex does not form. The performance of enzymes can be affected in several ways some of which I have explained below.

The volume of CO2 that is produced in the krebs cycle is important as this is the dependant variable. In this stage all of the nadh and fadh that has been produced in the previous stages is converted into atp. This takes place in the cristae of the mitochondria. The nadh and fadh electrons move. When the electrons pass from one carrier to another, a series of reduction and oxidation reactions take place which releases energy in the process. This energy is used to pump h ions from the matrix into the intermembrane space, thus creating a gradient where the concentration of the h ions in the intermembranal space is higher than it s in the matrix. The inner membrane contains enzymes called atp synthase and The h ions diffuse through these enzymes causing energy to be released which is used to synthesise atp through phosphorylation.

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osmosis essay

Osmosis, and diffusion pdf fileAP: lab-related ap exam

The glyceraldehydes-3-phosphate converted into pyruvate via the oxidation process where each gal3P molecule releases 2 hydrogen ions and 2 electrons. The electrons are then transferred to nad to produce nadh (reduced nad) and the energy is used to produce 4atp from 4adp and 4Pi. Finally there is a net yield of 2 molecules of atp, and 2 molecules of pyruvate which is used in the link reaction and 2 molecules of reduced nad which carries on to the link reaction. Link reaction, in the link reaction the 2 molecules of pyruvate leave the cytoplasm of the cell and enter the mitochondrial matrix. This is an oxidation reaction where 2 nad molecules oxidise 2 pyruvate molecules into 2 acid molecules. These 2 molecules of acetic acid then go on to combine with 2 coenzyme-a molecules to form Acetyl co enzyme.

In the end of this stage 2 molecules of reduced nad form, 2 molecules of CO2 is lost and most importantly, acetyl co enzyme a is formed through the conversion of pyruvate. This is then used in the next stage of respiration. Krebs cycle, at the start Acetyl coenzyme a, combines with Citrate synthase an enzyme as well and a 4 carbon molecule called oxaloacetate, forming Citrate. Then, business citrate goes through the process of oxidative decarboxylation which forms a 5 carbon molecule called this point nadh is produced and CO2 is removed. In the latter stages of the krebs cycle, the oxoglutarate is changed into a 4 carbon oxaloacetate molecule. Nadh is made and 1 molecule atp is also made.

The correct temperature in the water bath was maintained by adding more hot water to it throughout the experiment. Background information: yeast, saccharomyces cerevisiae, also known as yeast, is a micro organism that uses saprophytic digestion to break down substrates. This is achieved through releasing specific enzymes to break down specific substrates, but if yeast does not contain a certain types of enzyme then it cannot break down its substrate. The more the enzyme of a particular substrate, the faster the rate of breakdown and therefore the more co2 is produced. This will help me to test how much CO2 each substrate produces. Yeast can also respire aerobically and anerobically depending on the availability.


If there is plentiful of O2 then yeast would respire aerobically with sugars, producing H2O and CO2 as waste products. However, if no oxygen is available then the fermentation would occur which converts sugars into co2 and ethanol. Respiration, respiration is the process by which energy is released energy from glucose in the presence of Oxygen, forming carbon dioxide and water as waste products. Glucose releases energy in a series of reactions that take place inside components of the cell. The stages are briefly explained below: glycolysis, to get the sugar in a more reactive form it is produced to fructose-1,6-bisphosphate by the addition 2 phosphate molecules. This process is a phosphorylation reaction. The fructose-1,6-bisphosphate is then broken down into 2 molecules of glyceraldehydes-3-phosphate, which comprises of 3c each.

Osmosis and diffusion lab report

400cm3 of water was preheated to the same temperature as the yeast using the bunsen burner. The trough was filled with water and a measuring cylinder was inverted by filling it statement with water then pressing a piece of paper onto the top to prevent any air bubbles from getting. The beehive shelf was placed in the centre of the trough and the measuring cylinder was clamped in place, with the top resting on the beehive shelf, the hole being directly under. The yeast was placed in the preheated water-bath and the bung from the delivery tube was replaced. The delivery tube was inserted into the hole in the side of the beehive shelf and the stop watch was started. Thirty seconds was timed then the beaker with the yeast/carbohydrate mix was swirled for 5 seconds to mix the yeast/carbohydrate. This was repeated every thirty seconds for fifteen minutes, with readings being taken at three five minute intervals.

osmosis essay

more particles in a given volume. If the concentration of carbohydrate/yeast is increased there are more enzymes known as zymase, produced. This means there are more active sites for the carbohydrate substrate to attach to and the reaction happens faster. Therefore a balance must be reached between temperature so it does not denature the enzymes but is high enough to activate a reaction. Also, having a highly concentrated solution is seemingly advantageous but this can cause osmotic problems, so another balance must be reached, as to avoid this problem, but not to discourage a reaction. Apparatus: beehive shelf Clamp Stand 50ml conical flask. Trough Clamp Thermometer 50cm3 measuring cylinder heat proof mat Spill 500ml beaker Bunsen burner Delivery tube with bung. Tripod gauze stopwatch 25cm3 of baker's yeast 25cm3 of sucrose Electronic water-bath. Method: 25cm3 of baker's yeast and 25 cm3 of sucrose was mixed together and preheated at the required temperature for 15 minutes in an electronic water-bath.

The rationale for conducting this pilot experiment was that enzymes are biological catalysts that are made up of lab globular proteins which are activated to work by temperature. They exist in the yeast and our bodies and therefore work best at 40ëšc, however, they denature soon after and so our body temperature is kept at 37ëšc to ensure this does not happen. Denaturation is the irreversible loss of 3D structure of enzymes and can be caused by excess heat or a change. According to the collision theory however, in order for a reaction to take place a certain level of energy, called the activation energy, must be reached. This energy needs to be reached by the particles colliding in the right way and fast enough, so a reaction can take place. By giving the particles more energy it encourages more to collide therefore the activation energy can be reached and a reaction can happen. The kinetic theory explains the effect of temperature, volume and pressure on the number of collisions.

Osmosis research paper vivere senza dolore

Print, reference this, published: 23rd March, 2015, the aim of empire this investigation is to examine what effects different substrates have on the respiration of yeast. I will investigate this by measuring the amount of carbon dioxide evolved during anaerobic respiration. Pilot Experiment: Before we could test which carbohydrate and type of yeast produced more carbon dioxide, we had to standardise the other variables of this experiment; temperature and concentration. Therefore, in order to find the optimum conditions we carried out a pilot experiment. In this experiment we used a range of temperatures from 10Ëš to 60ëšc and three different concentrations of carbohydrate 1, 5 and. The experiment was carried out as a group experiment with everyone being allocated a different temperature and concentration to test. It was carried out over a standardised period of 5 minutes.


osmosis essay
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