... containing protein may be of poor biological value if it is deficient in one or more of the 8 essential amino acids: lysine, tryptophan, methionine, leucine, isoleucine, phenylalanine, valine, and threonine. Proteins of animal origin have the highest biological value ...

... be restored when the chemical bonds in a single mole of glucose are broken. Aerobic respiration commences with the process of glycolysis (literally: sugar splitting). This process takes place in the cytosol in the cytoplasm of the cell whereas the ...

... and more distinguishable cells and organelles. When soaked in dye the cells and organelles change colour this is due to a process of ion exchanges. In each cell the chromagens (the staining part of the cell) exchange the cations ...

... sites being altered and no-longer fitting the shape of their substrate. Enzymes are never used up in a reaction so can continue to react with more substrates after one reaction. The enzyme used in this experiment 'Catalase' does denature around ...

... starch is present is by adding iodine to the solution and the solution will go blue/black if there is iodine present, but for a negative test the solution will stay yellow/brown. Starch is easily hydrolysed into soluble glucose by amylase ...

... the conversion of hydrogen peroxide, a powerful and potentially harmful oxidizing agent, to water and molecular oxygen. Catalase is located in a cell organelle called the peroxisome. Peroxisomes in animal cells are involved in the oxidation of fatty acids, and the ...

... break the bonds in the reactants in order to form the new products. All enzymes are globular proteins, each with a specific three- dimensional tertiary structure that determines its function. Enzymes are usually specific to the substance- or substrate- they ...

... I am using glucose because it reacts with yeast. The preliminary experiment showed that as the concentration of the water and yeast solution to the fixed amount of glucose increases the rate of reaction and therefore produces more carbon dioxide, we ...

... by secreting the enzyme zymase (a complex of 12 enzymes) in the yeast which acts on simple sugars such as glucose. The alcohol produced has been used in making wines and beers and the carbon dioxide produced has been used ...

... plastic should appear see-through. Prediction There are many important factors that will affect my experiment. The most important factors will be concentration of the Trypsin, temperature of the Trypsin and surface area of the film piece. I will be using temperature as ...

... "Biology A Functional Approach" by M.B.V. Roberts.] I intend to investigate the effects on the reaction rate upon altering the concentration of the enzyme. In order to do this while also ensuring a fair test, I shall aim to maintain ...

... "Biology A Functional Approach" by M.B.V. Roberts.] I intend to investigate the effects on the reaction rate upon altering the concentration of the enzyme. In order to do this while also ensuring a fair test, I shall aim to maintain all ...

... from "Biology A Functional Approach" by M.B.V. Roberts.] I intend to investigate the effects on the reaction rate upon altering the concentration of the enzyme. In order to do this while also ensuring a fair test, I shall aim to maintain ...

... concentration of the liver catalase increases, the rate of reaction (gas produced) will increase too. Method: 1. Take the fresh piece of liver and with a knife cut 3 as far as possible similar rectangles of liver. Use a scalp ...

... width and 2.5 cm thick. On the side of the kidney with the smaller curve is an opening called the hilum, where blood vessels, nerves, and the ureters enter the kidney. On one end of the ureters is a funnel-shaped ...

... million kinds of protein molecules that can be produced by a healthy population of B-cells. They are soluble and are always present in a fraction of blood plasma called gamma globulin. They are very specific due to their protein tertiary ...

... so on. Collagen is probably the most important building block of the animal world as more than a third of the body's protein is collagen; it makes up 75% of our skin. Collagen acts as a sort of scaffolding for our ...

... efficient metabolic reactions. The buffering effect may take place, for example, in the stomach. So when the conditions are too acidic then the amino group can take in the excess hydrogen ions or if the pH is too high then ...

... tertiary structure of an enzyme gives it its active site. The active site is where the substrate binds to in a reaction. If the active site were a different shape, the substrate would not fit in it so the enzyme ...

... weak spots; hence its strength. The Achilles tendon, which is almost all collagen fibres, can withstand a pulling force of300 N per mm2 of a cross-sectional area, around one-quarter the tensile strength of mild steel. Collagen in our cartilage and ...

... in the body. In their undifferentiated state in the laboratory, stem cells show an ability to divide indefinitely. The five cell lines established here in 1998 continue to divide, and show no evidence of a diminished ability to make more ...

... cells. Prokaryotic cells have no nuclear membrane; the nuclear membrane is a very porous membrane that allows molecules to easily pass freely from the cytoplasm. The chromosomes in a prokaryotic cell are in direct contact with the cytoplasm. In comparison ...

... and processes are triggered to destroy the foreign substances. Regulation of Body Temperature The skin acts somewhat like a thermostat, aiming to keep the body at a constant body temperature of 37° C. When the skin is exposed to high ...

... was overcome in 1954 when silicon was used for the semiconductor and the efficiency was increased to 6 percent. Then by 1989 the use of a device which concentrated light onto the cell surface using a lens, increased the efficiency ...

... When lymphocytes encounter an antigen for the second time, they mount a quick, vigorous, specific response to that antigen. This specific immune response is why people do not contract chickenpox or measles more than once and what makes vaccination successful ...