4446 Exam 2 Study Guide Lactose Mal Digestion/ Malabsorption 1. What are the products of lactose digestion? -The products of lactose digestion are glucose and galactose. 2. What is lactase deficiency? -Lactase deficiency is a deficiency in the enzyme that breaks down lactose. The causes of lactase deficiency include congenital defects‚ secondary lactase deficiency‚ and primary (acquired). 3. Define lactose maldigestion‚ identify the potential etiologies of lactose maldigestion‚ and describe
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• It is specific for tyrosine‚ the only amino acid that contain a phenol group on which a hydroxyl group is attached. It gives red precipitate. Hopkins_cole Test • It is specific for tryptophan‚ the only amino acid containing an indole group.The indole ring reacts with glyoxylic acid in the presence of a strong acid to form a voilet cyclic product. Nitroprusside Test • It is specific for Cysteine‚ the only amino acid containing sulfahydryl group. Forms red complex. Classification
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function at rates that are fast enough to sustain existence. Those who are lactose intolerant are simply individuals whose body does not produce enough lactase. Lactase is an enzyme found in the digestive system and is used to breakdown and digest lactose (dairy sugar) . Lactase breaks down the sugar found in lactose into monosaccharides – glucose
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| Positive for stringing | Verifies Gram-negative | Vancomycin | No zone of inhibition | Gram-negative (vancomycin resistant) | Motility | Only the length of stub is red | Negative for motility | Indole | Yellow layer after kovac’s reagent added | Negative for tryptophanase; Indole negative | Methyl Red | Turns red | Positive for acid at pH 4.0 or less ;MR positive | Voges-Proskauer | Stays yellow | Negative for acetoin; VP negative | Citrate Utilization | No growth‚
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molecular compound lactose. Description: Lactase is primarily a digestive enzyme that is produced by specialized cells that line the lumen of the small intestine. Lactase ’s primary function is to break down a sugar called lactose. Lactose is a sugar that is found in milk as well as many other dairy products. Since lactose is a very large sugar‚ it cannot be absorbed naturally by the human body. In order to metabolize this form of sugar‚ your body needs lactase to break down lactose into two smaller
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zero was calculated due to no variation between measurements. From the absences of glucose in negative control Tests C‚ D‚ and mostly B‚ the data supports the idea that the glucose that was measured in Test A solutions was due to lactase digesting lactose within the milk rather than being caused by the addition of lactase‚ some other sugar‚ or merely being present all along. This establishes a baseline value of undetectable or no initial glucose in the milks. The exception to this is Lactaid milk‚
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colony yellow i The sugar lactose and the pH indicator Neutral red – differentiate between non lactose fermenters and lactose fermenters The production of acid from lactose fermentation causes the colonies of lactose fermenters to appear Pink distinguishing it from other gram negative bacteria grow EMB(p. 111) blooded animals) organisms which grow and form pink colonies gram negative non lactose fermenting bacteria grow as colorless
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large number of sugars which can be used if there isn’t enough glucose available to support the energy needs of the cell. Sugars like lactose are “backup” carbohydrates. This means that the cell only metabolizes lactose if glucose is low and lactose is plentiful. B. The cell uses a negative control system (the lac operon) to respond to the availability of lactose in the environment. Negative control means that it’s a system in which the active substance acts to turn off
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of roots instead of buds‚ because of this action the plant as a whole can respond to its changing environment without requiring a nervous system. There are three different forms of native auxins including the most important of all auxins is IAA (indole-3-aceic acid) as pictured above. IAA is the most abundant and produces the most effects in plants. IAA is made in cells of the bud of plants and is synthesized from trytophan. IAA has a major impact in several plant activities such as: · Development
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Lac Z codes for b-galactosidase‚ which hydrolyze lactose into glucose and galatose [1‚2]. Lac Y codes for permease‚ which increases permeability of the cell to b-galactosides [1‚2]. Lac A codes for transacetylase‚ which detoxifies certain byproducts of lactose metabolism [1‚2]. In addition‚ there is a Promoter region‚ the binding site for RNA polymerase‚ and an Operator region‚ the binding site for repressor protein. In the present of lactose‚ it binds to the repressor protein and induces a conformational
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