... an enzyme structure, meaning that a smaller ammount of enzymes are hydrolysing the same amount of pectin molecules, making less juice each time. Once the non-competitive inhibitor binds to the enzyme, it changes the shape of the active site, ...

... possess a special feature, which they use to convert substrates into products, known as an active site. In the enzyme's globular structure one or more Polypeptide chains twist and fold, bringing together a small number of amino acids to form ...

... reproduce, passing on its characteristics to its offspring. These and other numerous similarities (including many identical or nearly identical molecules) demonstrate that there is an unbroken link between modern cells and the first primitive cells that appeared on earth. The ...

... to absorb water and mineral ions. Then the plumule (young shoot) emerges and grows up. The radicle and plumule continue to grow in to a young plant. For a seed to germinate it needs a supply of water, oxygen ...

... the hydrophilic regions are on the outside of the membrane. Due to the hydrophobic regions of the phospholipid bilayer, it is generally not possible for large charged molecules or ions to pas through the membrane freely. The phospholipids have a hydrophilic ...

... are named and what can be seen is described below * Prophase - The D.N.A coils up to become chromosomes, the nuclear envelope disappears and centrioles duplicate themselves. * Metaphase - The chromosomes line up across the equator (centre) of the cell ...

... is a diagram of the cell membrane: As you can see the cell membrane is made up of a phospholipid bilayer which the extrinsic and intrinsic proteins span through. Some of the extrinsic proteins act as antigens for cell recognition with ...

... ensures that the enzyme does not participate in the wrong reaction. The enzyme itself is unaffected by the reaction. When the products have been realized, the enzyme is ready to bind with a new substrate. Temperature is one of the ...

... 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 ...

... 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 ...