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International Baccalaureate: Biology
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- Marked by Teachers essays 11
- Peer Reviewed essays 1
seeds are placed in a hot environment, then their germination will be positively affected compared to cress seeds grown in a normal light environment because seeds Variables The independent variables in this experiment were the light and the temperature. We put some of the cress seeds under a bright light and others in a dark cupboard. As for the temperature, we put some cress seeds in a stove and others in a fridge. The dependent variable in this experiment is the germination.
- Word count: 1944
After adding in iodine, when amylase breaking down starch, less and less starch will be present and the color of this solution will become lighter and lighter. Equipments � 0.1% Amylase 0.5 ml � 1% Starch 5ml � 10 Test tubes and rack � Iodine solution � Syringes � Marker pen � Electronic water bath set at 20, 30, 40, 50, 60 and 70�C with thermometers � Dropper � Thermometer � Beakers � Spot-plates � Stopwatch Controlled variables � Same temperature of amylase and starch solution This can ensure that amylase can react with starch solution in the same temperature,
- Word count: 1232
* 4% Hydrogen Peroxide Solution (5cm3) * 3% Hydrogen Peroxide Solution (5cm3) * 2% Hydrogen Peroxide Solution (5cm3) * 1% Hydrogen Peroxide Solution (5cm3) * 0.5% Hydrogen Peroxide Solution (5cm3) * Coloured Liquid * Distilled Water * 3x 20cm3 Syringes * 1x U-Shaped Tube (manometer) * 1x Stopwatch * 1x Retort Stand with clamps * 1x Rubber Bung * 1x Tube * 1x Forceps * 1x Scalpel * 1x Ruler * 1x White tile * 4x Plastic Containers * 1x Safety Goggles * 1 pair of gloves Procedure 1. The chicken liver was cut into pieces each measuring approximately 1cm by 1cm by 1cm.
- Word count: 1206
As far as it is known every living thing uses ATP as its primary source of energy, from bacteria to plants. At any instant in time a cell in the human body can contain about one billion ATP molecules, but this amount is used up quite quickly and is normally recycled straight away in the mitochondria where chemiosmotic phosphorylation occurs. One way that ATP is used is for muscle contractions, when you are running, walking, even me typing this essay, your body is using ATP to move muscles for movement, but not only movement, but it isn't only used for
- Word count: 1166
The cups used for the solutes must be completely dry before adding the solutes in. The same potato must be used to obtain all potato chips, in order to keep the water potential of the potato. The experiment must occur at room temperature. The same balance must be used, to achieve accuracy in measuring the mass. Equipment List: - Stop Watch - Electronic Scale - 1 whole potato - Cork Borer - 1 Piece of paper towel (cut into 5 pieces)
- Word count: 1975
Enzyme Coursework. Investigation to find the effect of substrate concentration on the rate of an enzyme controlled reaction5 star(s)
The rate of an enzyme controlled reaction are mainly affected by: temperature, substrate concentration, enzyme concentration and pH. By increasing the substrate concentration, there is a higher chance of a substrate colliding with an enzyme and subsequently reacting (as there is simply more substrate moving around in the solution). Increasing the substrate concentration further will cause the rate of reaction to plateau when all of the enzymes' active sites are constantly in use - at which point the enzyme concentration can be considered a limiting factor.
- Word count: 1640