... them into two separate test tubes * Put the two test tubes with the yeas and glucose and the methylene blue into the water bath. * Take them out when they get to the temperature you want them to be then tip ...

... phase (G2). (G1) - Many substances are synthesised here, especially proteins. There is an increase in the size and number of organelles, and cell specialisation may take place. (S) - At this point the cell will divide again ...

... fit into the active site the mode of enzyme action is comparable to a lock and key. Sometimes the substrate attaches to the active site and triggers a shape change in the enzyme molecule which improves the fit further and causes ...

... the volumes available to be read at 30 second intervals. Key Variables: The hydrogen peroxide concentration must reamin at 5cm3 through out the experiment, and the yeast concentration will be increased by 0.5cm3 for eacr experiment. Pilot Study Results: To find out exactly ...

... the volumes available to be read at 30 second intervals. Key Variables: The hydrogen peroxide concentration must reamin at 5cm3 through out the experiment, and the yeast concentration will be increased by 0.5cm3 for eacr experiment. Pilot Study Results: To find out exactly ...

... broken down into two products, ammonia and carbon dioxide. These can easily be excreted through the cell by exocytosis, which then can be removed from the body though mouth, nose, urine, faeces etc. Urease can also be used in industry for ...

... the shapes of enzymes are changed and the enzymes can no longer combine with the substances. This is one of the reasons why organisms may be killed by prolonged exposure to high temperatures. The enzymes in their cells are denatured ...

... After the equilibrium has been reached there will be no net movement of water molecules. Osmosis is the net movement of water molecules from a region of high concentration to a region of low concentration. Osmosis occurs in both animal and ...

... water and oxygen. It is able to do this due to the shape of the Hydrogen Peroxide molecule and its own active site. Substrate + enzyme Products + enzyme Hydrogen peroxide + Catalase Water + Oxygen + Catalase ...

... enzymes, but enzymes are not alive. Enzyme molecules function by altering other molecules. Enzymes combine with the altered molecules to form a complex molecular structure in which chemical reactions take place. The enzyme, which remains unchanged, then separates from the ...

... use of enzymes. However, the reaction is so slow that levels would rapidly increase which would result in death of that organism. One method of rapid detoxification is the use of enzymes, these act as catalysts which greatly increase the ...

... the amount of inhibitor used. The % transmission will remain constant for all solutions despite varying concentration of inhibitor. Alternative Hypothesis As the concentration of sodium dihydrogen phosphate is increased the rate of reaction will decrease. This will be indicated by ...

... 4 types of casein, which we can divide into 3 groups; alpha, beta and kappa. Kappa casein plays an important part in milk coagulation via rennin as the enzyme targets a specific bond in this and transforms it into para-kappa-casein. ...

... mortar and pestle. 3. The juice was filtered by muslin cloth. 4. A beaker of boiling water was prepared. 5. Juice collected was heated in the water bath for 10 minutes. 6. The boiling tube was allowed to cool down. 7. 1 ml DCPIP solution ...

... the water molecules pass from a high concentration, i.e. In the water itself, to a low concentration, i.e. In the potato chip. Therefore, the chips in higher water concentrations will have a larger mass than in higher sugar concentrations. The graph ...

... to pass through the beetroots cell membrane. This happens at a constant rate but there are several factors that affect the rate of diffusion. Only one of these factors is important for this practical and this is temperature. When the ...

... gauge the concentration of urea present, assuming that it is all catalysed by the urease. If the pH is very high, it means that there is a high concentration of ammonium carbonate, which has been formed by urea. Accordingly, a ...

... 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 ...