... temperature to use for our main experiment would be 40°C as this produced the full clot quickest. Main Experiment Aim From this experiment, we aim to find out how different concentrations of the enzyme rennet affect the clotting of milk with a set ...

... change. Most chemical reactions require an initial input of energy, called the Activation Energy. Molecules need to collide in order to react, this is known as the collision theory. When they collide they may not react, as certain amount of ...

... of the chromosomes. The microtubules attached to a kinetochore exert tension on its chromatid. For each dyad, one of the kinetochores is attached to one pole, the second (or sister) chromatid to the opposite pole. Failure of a kinetochore to ...

... curd it will take into consideration of the nylon filter. After the 10-minute time period has elapsed take the nylon filter in your left hand and place over the test tube and take it over a sink. Then invert the ...

... then be separated from the whey to make cottage cheese. However in the experiment which I am carrying out, when the milk starts to coagulate flecks are first formed.¹ ¹ http://www.glue.umd.edu/~nsw/ench485/lab1.htm 200 Prediction: My prediction is that when the concentration of calcium ions ...

... of reaction. They are specific e.g. amylase always acts on starch. Enzymes can be used over and over again. They can work up to temperatures of 40°C but if the temperature goes above 45°C the enzymes become denatured and cannot ...

... so does the kinetic energy that both the enzymes and substrates possess; which means there will be a greater number of enzyme - substrate collision and thus a greater rate of reaction. However although a certain temperature is required for ...

... and recorded it. We did this seven times for each of the temperatures. When we examined our results we could see that they weren't very accurate. This was because of the markings on the measuring cylinder. We then decided to ...

... 2H2O + O2 Catalase is present in peroxisomes, which are large organelles inside cells. Peroxisomes are involved in the oxidation of fatty acids in animals. Catalase, like all enzymes, is affected by certain factors such as temperature and pH, as well ...

... this case Hydrogen Peroxide), is called the active site, it is theorized that enzymes work with a "lock and key" mechanism (the enzyme's active site being the lock, the substrate being the key). Once the enzyme has acted on the substrate, ...

... a scalpel is used to cut objects into small pieces. It was then cut into 40 discs using the scalpel. Next the discs were placed in a boiling tube and rinsed repeatedly in till the water ran clear. Then two ...

... molecules therefore it is less viscous than it is when cold. Apparatus and its use Apparatus Use 1 Angle measurer To measure the angle of the tray. 1 Baking tray To act as the surface of the volcano. 1 Bunsen burner To heat the water. 1 Clamp + stand To ...

... to form water and oxygen. Enzyme Reactant 'Lock and Key' Bonds break Products released (catalyse) (hydrogen peroxide) (Oxygen and Water) 2H2O2 2H2O + O2 However, when the temperature exceeds body temperature (optimum temperature), which is ...

... needing to be supplied with energy (normally this is done by heating). An enzyme can speed up a reaction by a billion times. Enzymes are known to be specific due to the shape active site of an enzyme (which binds on ...

... factors effect the reaction greatly. The chosen factor for this investigation is the rennin concentration. The others will remain constant. Prediction :- I believe that as the concentration of the enzyme decreases the rate of reaction will reduce. I came to this prediction ...

... means that the enzyme will no longer work because it will no longer fit. The active site will be ruined. The enzymes react like a lock and key, only one lock fits the key. When the two join then you ...

... 1993, 2000) Catabolic reactions release energy and are concerned with mobilizing food stores and for making the energy available to the cells. This energy is needed for three main purposes, * For synthesis of proteins * For contraction of muscles, secretion of glands ...

... that changes colour depending on the amount of protein present in the solution. Hypothesis: In this experiment, I will be looking to see the effect of increasing the temperature on the mass of casein present after fifteen minutes in a water ...

... energy is the energy needed to get the rock to the top of the hill. When it is pushed of the top it no longer needs any help and it does it by itself. The diagram below explains activation energy: ...

... each enzyme is the active site or the place where the substrate fits and where the chemical reaction takes place. Since the active site for all molecules of one enzyme will be made up of the same arrangement of amino ...

... the 'Kinetic theory', this states that the extent of a molecules movement depends on its state and temperature. As temperature increases, the particles become more 'exited', and so move around and collide and react more frequently and rapidly. It is ...

... to break down the starch at all. This is because body temperature is around 40oC, and enzymes are designed to work at this optimal temperature. At temperatures over 40oC, I predict that amylase would begin to denature to an extent ...

... fit into under the lock-and-key hypothesis, thus forming a greater number of enzyme-substrate complexes and thus forming a higher product rate (apple juice). Enzyme concentration is directly proportional to the rate of reaction provided the substrate concentration is maintained at a ...

... that no cells are plasmolysed until the concentration of the external sucrose solution is approximately 3.25M. No cells are plasmolysed below this concentration, because water always moves from a less concentrated medium to a more concentrated medium. In other words, ...

... reaction they are about to perform and the shape of the enzyme and the substrate are very important, because the shapes must fit each other, when they bind together, if the enzyme is to work. They bind together in what ...