Unit 1 Lesson 1 Key Question Biology SBI4U-C ILC 1) Mg2+ Has 10 electrons. 2) Carbon -14 would not be effective at dating bones that are millions of years old. Carbon -14 is effective at dating to a maximum of 40 000 to 50 000 years old. The isotope decays over time and would not be present on bones that are millions of years old. 3) Hydrolysis - Water used to breakdown molecules. Hydro means water and lysis means to breakdown. An example of hydrolysis in action within our bodies is how our
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Test Biuret Test Reagents CuSO4 sol’n‚ diluted NaOH Test for Intact proteins and protein hydrlysates (at least tripeptide‚ 2 peptide bonds Result Pink to violet blue color Ninhyrin Test 1‚2‚3-indanetrione monohydrate or triketohydintene hydrate‚ ethanol Alpha- amino group (usually a general test for amino acids) Xanthoproteic Test Conc. HNO3‚ conc. NaOH For W‚F‚Y (aromatic except for H) Blue to blue-violet Oxidative decarboxylation color & deamination
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area‚ type your observations‚ mainly focusing on the color‚ but also the layering as appropriate. Be sure your interpretations match your observations! The chart area will expand as you type. BENEDICT ’S TEST FOR SUGAR IODINE TEST FOR STARCH BIURET TEST FOR PROTEIN SUDAN TEST FOR LIPID WATER (-) - - - - _OBSERVATIONS_ Blue Yellow Light blue Clear w/ red layer on top GLUCOSE (+) + - - - _OBSERVATIONS_ Red-Orange Yellow Light blue Clear w/ red layer on
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ABSTRACT ------------------------------------------------- Food contains nutrients that are very significant to the body. The basic essential nutrients‚ vitamins‚ and minerals play very significant functions in the different metabolic processes. In order for the nutrients to be known‚ several tests were performed to qualitatively analyze nutrients for the different food samples. Reagents were used as indicators to test common food substances for the presence of specific nutrients. Fruit juice
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Separate preparations were made in each part. In analysis of peptide digestion‚ determination of the presence of polypeptide chains and the extent of digestion through the hard-boiled egg white was performed. All of the test tubes were positive for Biuret test which indicates presence of polypeptide chains while for the rennin test‚ curd formations were observed in test tubes 3 and 4 only. In gastric analysis‚ the values for free acidity and total acidity were computed. The free acidity is 20.83 N
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The digestion of milk fats by pancreatic lipase and the digestion of proteins by pepsin and trypsin By Jenny Lam Abstract The purpose of this project was to determine how pancreatic lipase and bile salts digest fats to fatty acids and glycerol and how pepsin and tryspin digest to polypeptides. Litmus solution (pH indicator) was used for the fats to indicate the occurrence of the digestion of fats in experiment A. Egg whites was used as the substrate for the enzymes in experiment B.
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Macromolecules in Food INTRODUCTION The most common macromolecules found in living organisms are lipids‚ carbohydrates‚ proteins‚ and nucleic acids. (Hillis et al 2011). Macromolecules are normally containing two or more monomers in them and their main functions are to store energy. Starch is a huge molecule made up of hundreds of simple sugar molecules (such as glucose) connected to each other. Most foods are known to be combinations of macromolecules. METHODS The tests performed were iodine
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Practical 12: Digestion in Humans Aim: To distinguish between 5 liquids to come to a conclusion from which region of the alimentary canal it was extracted from. Hypothesis In this practical‚ we have been given 5 unknown solutions hence it is not possible for us without any logical analysis to come up with a conclusion regarding the positioning along the alimentary canal. We cannot come up with a proper answer or predict results without running through the tests. I though can base my
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those nutrients. Materials: 2 safety goggles 1 eye dropper Heat source 2 beakers 4 test tubes 1 test tube clamp 1 test tube rack 1 glass stirring rod 3 teaspoons canned whole-kernel corn 10 ml fresh‚ whole‚pasteurized milk 1 small biuret reagent 1 small benedicts solution 1 small bottle iodine 1 small bottle sudan 4 1 blender Procedures: 1)Heat water in a graduated cylinder . 2)Blend your corn in the blender and add as much water so that it turns into a liquid. 3)Pour
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it to the 10 mL H2O2 (aq) solution. 9) Titrate the acidic H2O2 (aq) solution with KMnO4 (aq). 10) Repeat steps 7-9 until three consistent results are obtained within 0.1 mL. 11) Dispose of solutions into waste buckets. Materials: Lab Apron - Biuret Eye Protection - Graduated Cylinder 100
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