Biology lab AIM: To test a leaf for starch APPARATUS/MATERIALS : * bunsen burner‚ tripod stand‚ wire gauze(OR 90oC electric water bath OR hot plate) * 250 cm3 beaker * boiling tube * anti- bumping granules * forceps * test tube holder * white tile * leaf to be tested (hibiscus leaves are excellent) * 90% ethanol * iodine/potassium iodide solution PROCEDURE: The video above shows the steps in Testing a Leaf for the Presence of Starch. The Procedure outlined
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dictated by the nucleotide sequence of their genes‚ and which usually results in folding of the protein into a specific three-dimensional structure that determines its activity. What is starch?2 Starch is a carbohydrate consisting of a large number of glucose units joined by glycosidic bonds. This polysaccharide is produced by most green plants as an energy store. It is the most common carbohydrate in human diets and is contained in large amounts in such staple foods as potatoes‚ wheat‚ maize (corn)‚ rice
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The aim of this experiment is to better understand the process of fermentation of yeast in different concentrations of sucrose. The experiment worked with yeast and sugar (sucrose and glucose) to determine the rate of fermentation by testing the pressure of C02 in the test tube. The experiment tested the metabolic capability of yeast anaerobically meaning no oxygen was present (this was ensured by the thin layer of oil on the top of the solution). This means that the metabolic rate of the yeast could
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stay alive‚ a cell must continually regenerate its supply of ATP (from ADP & inorganic phosphate). A working muscle cell recycles its ATP at a rate of ~10 million molecules per second! Cells harvest potential energy from metabolic fuels such as glucose by catabolizing them and using the energy to synthesize ATP. This process of harvesting chemical energy is called respiration. Different organisms use different catabolic processes to harvest chemical energy. Most eukaryotic cells use cellular
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Testing for Sugars Observations Data Table 2: Benedict’s Reagent Results. Test Sample Predicted Results Benedict’s results #1 Glucose none positive #2 Starch none negative # 3 Onion juice Sugars present positive #4 Distilled Water none negative Questions A. Which of the test tubes are used as the positive and negative controls? The positives are 1:glucose and 3: onion juice. The negatives are 2:Starch and :4 water. B. How did the predicted results compare to the actual results? I
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centimeters and its mass increased by 62%. Gummy bears are made up of a mixture of sugar and glucose syrup along with citric acid and gelatin. Citric acid is an organic acid to add a sour taste to food and drinks. Gelatin is a mixture of peptides and proteins produced by partial hydrolysis of collagen extracted from the skin. Therefore‚ the salt water entered the blue gummy bear and mixed up with the sugar and glucose syrup leaving it small and hard. The orange gummy bear increased in size and mass because
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fermentation. In specific‚ how the type of sugar affects the rate of fermentation. The aim of this experiment was to find which type of sugar was best suited to produce ethanol. In the experiment‚ four different sugars were used‚ they included sucrose‚ glucose‚ lactose and fructose. This research is still relevant today‚ as alcohol is still consumed and is required on a large scale. This makes it crucial to companies to find the best sugar to use in the fermentation process. Cellular respiration is a process
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Sugar is sucrose that is extracted from sugar beets and sugarcane. Sucrose‚ or table sugar‚ is the most common added sugar‚ and is found in the form of high fructose corn syrup. Americans consume up to 60 pounds of sugar in one year‚ that is 76.7 grams of sugar per day‚ which equals 19 teaspoons or 306 calories! This number is much larger for people that eat more processed foods or drink soda beverages on a regular basis. No sugar is healthy‚ but an average amount of sugar for men‚ should be around
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absorb glucose from your blood and store it as glycogen for future energy needs. Glucose is a form of sugar used by your body for energy‚ and is derived from the consumption of carbohydrates (e.g. starch). So you eat a donut‚ your body breaks it down‚ glucose is released into your blood‚ insulin is released as a reaction‚ and triggers your liver‚ muscles and fatty tissue to absorb this donut-derived glucose as glycogen for use down the road when you need it. So the
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the African American community dramatically. One is said to be diabetic when the blood glucose levels are elevated above what is considered normal. An organ within the human body called the pancreas produces insulin‚ which is a hormone that assists glucose into our cells to then be used for energy. The human body absorbs glucose from the food that is consumed every day‚ and most of that food is turned in to glucose. Individuals are diagnosed with diabetes whenever their pancreas produces and insufficient
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