Undergraduate Questions (50 Pts) 1. (4 pts) A chemist working in a pharmaceutical lab synthesized a new drug as a racemic mixture. Why is it important that she separates the two enantiomers and test each for its biological activity? 2. (6 pts) Phosphoric acid (H3PO4) has three dissociable protons‚ with the pKa’s shown below. Which form of phosphoric acid predominates in a solution at pH 4? Explain your answer. Acid pKa H3PO4 2.14
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Identification of Unknown Carbohydrates using various biochemical tests Date of experiment: 11/10/2012 Name of Student: Vicki Marshall Introduction A series of biochemical tests was carried out to identify unknown carbohydrates. There were six carbohydrates that needed to be identified; they have been randomly labelled A-F. The carbohydrates are glucose‚ fructose‚ maltose‚ lactose‚ sucrose and starch. There was six tests that were carried out to help identify them‚ these were: Iodine Test‚ Solubility in
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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‚ and cassava. Its presence or absence in samples is also the basis for iodine tests. What is a reducing sugar?3 A reducing sugar is any sugar
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Abstract Carbohydrates are the most abundant organic compounds in the plant world. They act as storehouses of chemical energy (glucose‚ starch‚ glycogen); are components of supportive structures in plants (cellulose)‚crustacean shells (chitin)‚ and connective tissues in animals (glucosaminoglycans); and are essential components of nucleic acids (D-ribose and 2-deoxy-D-ribose). Monosaccharides‚ oligosaccharides‚ and polysaccharides are theclassifications of carbohydrates. This experiment involves
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Viviana Veber Bio 1510 Sec 21 Carbohydrates Introduction: The objective of this experiment was to identify the reaction of carbohydrates in Benedict’s test‚ Barfoed’s test and Iodine test. Carbohydrates are essential to living organisms‚ and the principal role of carbohydrates is the production of energy. Carbohydrates are groups of sugars that contain carbon‚ oxygen‚ and hydrogen in a 1:2:1 ratio. Three main units of carbohydrates are monosaccharides‚ disaccharides‚ and polysaccharides
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Carbohydrates For my health project I did carbohydrates. They are the bodies energy source. Carbohydrates supply the body with the energy it needs to function. They are found almost exclusively in plant foods‚ such as fruits‚ vegetables‚ peas‚ and beans. Milk and milk products are the only foods derived from animals that contain a significant amount of carbohydrates. Carbohydrates are divided into two groups‚ simple carbohydrates and complex carbohydrates. Simple carbohydrates‚ sometimes
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Complex Carbohydrates PERSONAL SUMARY: There is a very real difference between simple and complex carbohydrates. Let’s look at them. Simple carbohydrates‚ found in rice‚ pasta‚ white potatoes‚ and some dairy products‚ contain sugars that are broken down quickly by your body. This will provide your body with a quick burst of energy‚ but if the carbohydrates are not used quickly‚ the sugar will turn to fat. That’s why low-carb diets cut them out. But those diets often lump all carbs together
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Effect of drinking soda sweetened high-fructose corn syrup on food Michael ABSTRACT in the with intake aspartame and body or weight G TordoffandAnnette To examine MAlleva suggest that sweet oral stimulation initiates a cephalic-phase metabolic reflex that increases appetite (10). The long-term effects of artificial sweeteners on food intake and body weight are less clear. Although some investigators report weight gain in animals given artificial sweeteners to eat or drink (1 1-13)
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Nutrition Research Task – Year 10 Pass Carbohydrate loading is a strategy involving changes to training and nutrition that can maximise muscle glycogen stores prior to endurance competition. The technique was originally developed in the late 1960’s and typically involved a 3-4 day ’depletion phase’ involving 3-4 days of hard training plus a low carbohydrate diet. This depletion phase was thought to be necessary to stimulate the enzyme glycogen synthase. This was then followed immediately by
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Name: _____________________________ Chapter 4 – The Carbohydrates: Sugar‚ Starch‚ and Fiber The Simple Carbohydrates: Sugars Identify food sources for each of the monosaccharides: • Glucose: • Fructose: • Galactose: Identify food sources for each of the disaccharides listed: • Sucrose: • Lactose: Describe the condition called lactose intolerance. What causes lactose intolerance? Lactose intolerance: Cause: Are there any treatments for lactose intolerance? What foods may
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