Science Essays

Hypothesis Diffusion is the movement of molecules moving from a region of high concentration to a region of low concentration. If a drop of food colouring is dropped in increasing temperatures of water, then it will spread faster throughout the water because an increase in temperature means an increase in …

Robert Hooke(1665): Published first book on cells. Discovered cells when looking at cork under a microscope. Discovered cell structure of plants. Anton von Leewenhoek (1650-1700):Dutch. First observed protists. With a simple lens(x200), he observed unicellular organisms & nuclei. By using his ability to grind lenses, he greatly improved the microscope …

There are many examples of natural selection. One of the most famous is that of Darwin’s finches. He observed these birds when he travelled to the Galapagos Island when on his travels on the HMS Beagle. He observed the differences in the size and shape of the bird’s beaks on …

Background information “Antimicrobial is the name for a chemical that either kills or prevents the growth of microbes (‘bugs’ or ‘germs’) such as bacteria, viruses, fungi or protozoa. Some antimicrobials are produced by bugs themselves (e.g. penicillin is produced by the penicillium mould), others are designed in the laboratory. Different …

How can the Michaelis Menten constant for the dextrase content of yeast be calculated with simple experiment on hydrolysis of sucrose? Introduction: In anaerobic conditions yeast cells break down sugar molecules into ethanol and produce carbon dioxide. The process is called alcoholic fermentation. The equation of this process is: C6H12O6 …

1. Introduction The aim of this experiment was to investigate water quality by chemical tests with which the momentary characteristics of the water could be assessed very precisely. The temperature, turbidity, flow velocity, ph (measures the alkality or acidity), total hardness, ammonium, nitrate, phosphate and dissolved oxygen content (measures the …

Introduction: There is often a rule in cooking that says; do not rip off the skin of the beetroot or wash the tail of the beetroot when you cook*1, unless you want to dye the cooking water red. This red pigment that comes out of the beetroot is caused by …

Figure 1 showing cell membrane structure From the graph it is evident that as the temperature increases, the % transmission of light through the solution(distilled water and anthocyanin) decreases.Therefore it can be deducted that temperature is one of the factors that affect the diffusion of anthocyanin because the amount of …

In this study of increasing target temperature of enzyme catalase coated onto paper filter disks reacting through 3% hydrogen peroxide solution in culture tubes, there was an increase in amount of time taken for the enzyme catalase coated filter paper disks to float to the top of the 3% hydrogen …

Viruses are unique in that they have been classified as both living and nonliving, the reason for this is that they cannot reproduce without a host cell. Also they are acellular, which mean they don’t have cells1. There are many different viruses, our body can fight most of the viruses …