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International Baccalaureate: Biology
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- Marked by Teachers essays 11
- Peer Reviewed essays 1
River Thame Investigation How does the distribution of mayfly larvae depend upon the rate of flow of the river
Variables: Independent ? speed of the stream Dependent ? number of mayfly larvae Controlled ? number of times data collected at each site, how the samples are collected ? kick sample and speed probe, transect across the stream at three places, data collected on the same day ? similar weather conditions. Method Materials: Speed probe from field centre, macro invertebrate net, Wellington boots, meter ruler, string, temperature probe The stream was sampled at the place it enters the field centre, where there is a meander and as it leaves the field centre ? just after a weir.
- Word count: 1271
To diagnose whether a patient has a disease, the doctor will take some blood in order to look for abnormal amounts of specific enzymes in the blood and then measure the plasma levels of the enzyme. Below is an image illustrating this. (Figure 1 taken from ?Clinical Enzymology?) Higher levels intracellular enzymes indicate cell damage as enzymes are meant to be inside the cells. If you find them in the plasma that means the cell walls have been damaged. Although if someone has low levels, it could also simply be because of genetics or due to the fact that it is natural change with age.
- Word count: 1120
I will also be setting up an experiment to show the mass change of the vegetables in each of the solution, and trying to find the osmotic potential of the vegetable. Hypothesis. According to particle theory, water molecules are in constant motion. As they move, they hit the membrane and create a pressure against the membrane called the water potential. Solutions with a low water potential have a high solute (osmotic) potential. Therefore, solutions with a high water potential have a low solute (osmotic)
- Word count: 1923