... The Prokaryotic Cell The Eukaryotic Cell Scientists believe that the eukaryotic cell originated from several different types of prokaryotic cell, hence the similarities between the two cell types. The contents of both cells are suspended in the cytoplasm, ...

... It lies close to the POSTSYNAPTIC MEMBRANE of the adjacent cell. Between the two membranes is a 20nm wide SYNAPTIC CLEFT. Function of Synapses 1. Prevents impulses travelling in the wrong direction. An impulse can pass along an axon in either direction, ...

... and Cyanobacteria predominate. In anaerobic conditions polluted or eutrophic waters, other photosynthetic bacteria are dominant. Photosynthesis of algae Photosynthesis (converting light energy into chemical energy) is performed in parts of the cell called chloroplasts. They can be found in different shapes and ...

... other with sufficient energy for the reaction to take place. This is collision theory. You can speed up the reaction by rising the temperature. A successful collision may require that the two molecules or species must collide with the correct ...

... fossil records of prokaryotes and the later fossil records of eukaryotes. Anaerobic amoeba-like Anerobic bacterium Aerobic bacterium bacterium. engulfs aerobic bacterium. becomes symbiotic inside the anarobic bacterium. When the original anerobic bacterium reproduced, so did the aerobic bacterium inside it, so all offspring ...

... fossil records of prokaryotes and the later fossil records of eukaryotes. Anaerobic amoeba-like Anerobic bacterium Aerobic bacterium bacterium. engulfs aerobic bacterium. becomes symbiotic inside the anarobic bacterium. When the original anerobic bacterium reproduced, so did the aerobic bacterium inside it, so all offspring ...

... here. Disaccharides are used as an energy source and are found in most foods i.e. natural cane sugar (sucrose) and are sweet and soluble. They usually occur as intermediates either in the building or breaking down of polysaccharides. They are also ...

... away from the water. In relating this to a plasma membrane two lines of lipids are present in a membrane, they arrange themselves such that the hydrophilic ends of each lipid on the first line (the inside part of the ...

... improve the life standards of the sufferer the fundamental fact is that this disease is carried through the genes of the sufferer and currently can not be prevented or even effectively treated. (2) 2. Possible solution With no feasible cure for cystic ...

... more effectively than non-enzyme detergents. However, using modern bleaching and brightening agents, the difference between looking clean and being clean may be difficult to discern. At present only proteases and amylases are commonly used. Although a wide range of lipases ...

... antibiotics, but the chance that one bacterium may have the resistance gene means resistance can be a huge problem. But in contrast it has been found that the effectiveness of antibiotics can help many in their fight against cancer, with ...

... makes them move faster. This results in an increase in the number of collisions between enzymes and substrate molecules, meaning that more of the desired product will be made in less time. Other factors which affect enzyme activity include pH ...

... the effects of enzymes such as pectinase, slowly breaking down this pectin layer. However it is not entirely known exactly which enzymes are responsible for this development. It is hoped that one day it may be possible to monitor this ...

... in medicine. Enzymes have many uses in medicine. Streptokinase helps to dissolve blood clots which limits the chance of a further heart attack. In addition, Urokinase removes blood clots, for example in heart disease by breaking down the blood clots. The ...

... enzymes for analysis. These two enzymes are immobilised (entrapped in an inert insoluble matrix in the process of immobilisation) onto a cellulose fibre pad. These pads forms the basis of Clinistix and Diastix. Glucose analysis (biosensors) allows quick, sensitive and ...

... Biosensors can be used as medical analytical reagents to test the concentration of glucose in urine for diabetes. 'A test strip is used which contains a chemical indicator called toluidine and the enzyme glucose oxidase.' (http://www.bbc.co.uk/dna/h2g2/A3328355). The test trip is ...

... they have. Uses of enzymes in medicine include: • Analytical tests: Diabetics use strips of paper impregnated with glucose oxidase to monitor their blood sugar. • The presence of enzymes where they should not be present can also help to ...

... making shows their value in quality control and efficiency of production. Use in alcohol-1 In the alcohol industry, fermentation depends on the action of enzymes helped by the yeasts and bacteria used in the production process. Beer brewing essentially involves the yeast ...

... complementary shape can fit in. This is called lock and key mechanism and suggests that one enzyme can only catalyse one reaction. However, enzyme slightly changes its shape when substrate binds to its active- site. This process is known as ...

... only fits into a specific lock, each enzyme has its own specific lock; each enzyme has its own specific substrate. This is called the lock and key theory. The enzymes never actually get consumed in the process; they just increase ...

... Aspergillus niger. The pectinase enzymes act in different ways on the pectins, for example they help soften their cell walls (they break down the cell walls). (The products of such enzyme assaults also act as a signal which causes uninfected ...

... most widely used enzymes is papain from the latex of papaya plant. Papain can be added prior to slaughter by injection or after slauter. [3] Proteases are also added to flours. The protein content of flour is largely responsible for the ...

... industry is that they need to be exceptionally hygienically clean to avoid contamination this is known as using aseptic techniques, slight changes in the delicate pH balance or temperature increase may lead to a possibility of rendering the enzyme batch ...

... to make consistently high-quality products by enabling better dough handling, providing anti-staling properties, and allowing control over crumb texture and colour, taste, moisture, and volume. The enzyme rennin is used to clot milk in cheese-making, and enzymes from yeast have ...

... added which break down substances in the food which the species body cannot digest. Many foodstuffs for farm animals such as wheat, rye, barley and oats contain non-starch polysaccharides (NSPs) which are an example of ANFs (anti-nutritional factors). They cannot ...