... - contain hydrolytic enzymes which can break down structures, acrosome in sperm heads digest a path to ovum. Mitochondria - made of two membranes, the inner one folded to form cristae which stick into the inner solution or "matrix" - carries ...

... acts as catalysts in biochemical reactions. These reactions are too slow to sustain life in the absence of enzymes. Each enzyme can be twisted and folded into the secondary and tertiary structure held by hydrogen or disulphide bonds. The secondary ...

... breakdown the hydrogen peroxide into water and oxygen. As it does this oxygen bubbles start to from on the surface of the bead as it is a product of the breakdown of hydrogen peroxide. Because the bead will be covered ...

... the same. (5) An equal amount of starch solution should be used with the same concentration. (6) Distance between the table lamp and the vial should be kept the same as light intensity should be kept constant throughout the two experiments. (7) A ...

... size potatoes. * Concentration of sucrose, which is the dependent variable in this experiment. This will be altered in order to complete the experiment. * Timing for experiment, if longer then I should expect to see a different mass change. This ...

... sense changes in their surroundings and respond to this change. This is sometimes also called Irritability. The changes they sense are of many types, such as temperature, light intensity, sound, day length and the presence of chemicals and the amazing ...

... could possibly get it. ...

... us what it would look like if it was raining by getting a bucket of water and throwing it all out onto the surface of the water around us. Each splash of water had the same neon-green glow to it. ...

... leucocytes. They are agranulocytes and have a large bean shaped nucleus. They only spend 2 to 3 days in the blood, and then they move to the tissues where they mature into phagocytic macrophages. Lymphocytes These make up approximately 30% ...

... careful with higher power objectives, since the counting chamber is much thicker than a conventional slide. The chamber or an objective lens may be damaged if the user is not not careful. One entire grid on standard hemacytometers with Neubauer ...

... from large elements that cannot be absorbed, into smaller more useful compounds that can be absorbed and then carried to where they are needed in the body. Mouth The mouth is the beginning of the digestive area. Chewing breaks the food ...

... lower temperature. BOILING POINT PRINCIPLE: Molecules which strongly interact or bond with each other through a variety of intermolecular forces can not move easily or rapidly and therefore, do not achieve the kinetic energy necessary to escape the liquid state. ...

... air occupies from 10 cm3 to 5 cm3, then there would be twice as many molecules per cm3 than before. This means twice as much pressure will be exerted due to twice as many molecules hitting the sides of the ...

... the sides of the container cause this pressure. If you decrease the volume that the air occupies from 10 cm3 to 5 cm3, then there would be twice as many molecules per cm3 than before. This means twice as much ...

... quicker for enzyme to hydrolyse starch. The temperatures I have chosen are 20°C, 25°C, 30°C, 35°C, and 40°C The experiment is done in software, which deals with science investigations The results of the experiment are shown in the below. Enzyme Temperature (°C) Time Taken to hydrolyse ...

... that was added, the more oxygen was given off. This leads me to think that the 'quantitative prediction', is true, so the amount of catalase added and the amount of oxygen given off is directly proportional. So, the more catalase ...

... the membrane). These are used to transfer none soluble substances in lipids, that would not be able to filter through the partially permeable membrane. From research I have discovered four main ways that cells use to move substances in and ...

... birth, and declines thereafter, replaced in effect by secretion of pepsin as the major gastric protease. Milk dose not coagulate on its own because of the kappa casein, which is deactivated by rennin. Because of this, I predict the rate that ...

... when the become cancerous. These can be in any of the Stages, G1, G2, or even S. There are a number of genes which exert control In the cell cycle, one of the best known is P53 which is implicated ...

... some viruses as well as many other things. So it is extremely difficult to prevent cancer from occurring in the first place. Instead we have to be able to kill the cancer after it has invaded the body. There are ...

... the tissue. * As that cell develops into a clone, some if its descendants suffer a second mutation * This further deregulates the cell cycle of that cell and its descendants. * As the rate of mitosis in that clone ...

... second sheet I set up was the multipliers sheet, which would hold all the factors and their multiplying figure. I entered the separate multipliers onto the sheet, age, sex, area, no-claims bonus and the type of insurance. I entered numbers in column ...

... by fractional distillation. This can be done because long chains have higher boiling points than short chains. Long chain molecules come off near the bottom of the column where it is hottest. Short chain molecules come out of the column near the ...

... a momentary shortage of oxygen to the brain. Fainting is your body's way of getting you to lie down, so that oxygen-carrying blood can quickly get back to your brain. By collapsing to the ground, your head and heart are ...

... and chemicals that cause extrinsic allergic alveolitis. Farmer's lung, which results from repeated inhalation of heat-loving bacteria in mouldy hay, is a well-known example of this condition. Another example is humidifier lung; it occurs when contaminated humidifiers or air conditioners ...