Chapter 1 The Foundations of Biochemistry Multiple Choice Questions 1. Cellular foundations Pages: 2-4 Difficulty: 1 Ans: C In a bacterial cell‚ the DNA is in the: A) cell envelope. B) cell membrane. C) nucleoid. D) nucleus. E) ribosomes. 2. Cellular foundations Page: 3 Difficulty: 1 Ans: E A major change occurring in the evolution of eukaryotes from prokaryotes was the development of: A) DNA. B) photosynthetic capability. C) plasma membranes. D) ribosomes
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Practice | Periodic Classification... Start Practice | Atomic Structure Start Practice | Principles and Processes... Start Practice | Gaseous State Start Practice | Polymers Start Practice | | | "Do if you have Time" Chapters | Aldehyde Ketone Start Practice | Solutions Start Practice | Solid State Start Practice | Mole Concepts Start Practice | Alkanes‚ Alkenes and Alk... Start Practice | Surface Chemistry Start Practice | Nuclear Chemistry Start Practice
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Enzyme as protein Dr.Samina Haq Quantitative and qualitative test for protein and amino acids • 1. 2. 3. 4. 5. 6. Qualitative test Ninhydrin test Biuret test Xanthoproteic test Millons test Hopkins-cole test Nitroprusside test Quantitative test 1. 2. 3. Spectrophotometric assay Protein shows maximum absorbance at 280nm due to presence of tyrosine and tryptophane. Biuret test shows 540nm Lowry test shows 750nm Ninhydrin Test • Amino acid containing a free
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Abstract The purpose of this paper is to gain an understanding about what alcohol is‚ how alcohol is produced‚ the metabolic processes involved with the breakdown of alcohol in the body and the enzymes that catalyze these reactions and how these biochemical reactions affect the liver and brain and the effects of alcohol on the human body. Introduction A good deal of the population consume alcohol‚ some more than others. The effects of alcohol consumption on the human body affects mainly the
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reporter susan scutti writes “Dripping generates higher heating coil temperatures than conventional use of e-cigarettes -- and this is a safety concern. "Higher temperatures lead to greater emissions of a class of harmful chemicals known as volatile aldehydes‚" including formaldehyde and acrolein‚ Shihadeh said.” this means that when teens and other people drip they are poisoning themselves which means that you child could be in danger of dying from this new trend. fox reporter Tanae Howard says “Another
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Experiment 29 – Borohydride Reduction of Vanillin to Vanillyl Alcohol Goal To perform a sodium borohydride reduction of an aldehyde to produce an alcohol. Reading and Working Ahead Your discussion should include a mechanism for this reaction. Review: OP 12 – Vacuum filtration OP 28 – Melting point (using Mel-Temp®) Procedure Notes Calculate the necessary mass of vanillin and sodium borohydride for the procedure below. Also calculate theoretical yield of vanillyl alcohol. You
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Bacterial Smears Are Fixed before Staining to? Answer It is important to heat fix the bacterial smear before staining so as to‚ kill the bacteria‚ firmly adhere the smear on to the microscopic slide to prevent washing off during staining‚ and to allow the sample to readily take up the stain. Reference: www2.hendrix.edu What is the purpose of heat- fixing the smear? It helps the cells adhere to the slide so that they can be stained. The purpose of heat fixing is to kill the organisms without
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Steam Distillation 6.6.12 Aim: To isolate and extract citrol from lemongrass oil using steam distillation. Theory: Impure chemicals are usually purified using distillation‚ allowing the changes in boiling points to separate the substances. Chemicals with high boiling points decompose before reaching the temperature necessary for separation‚ leading to the invention of steam distillation. The contamination is separated at lower temperatures and allows the separation of chemicals from their
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Purpose: To determine which chemical indicators that will indicate the presence of glucose‚ starch‚ lipid‚ and protein in various samples. Methods and Materials: For materials‚ please refer to p.18 in Biology 11 (replace Sudan IV with filter paper) For procedures‚ please refer to p.18-19 (except Part C) For Part C in Inv. 1A‚ please read the following procedures: 1.Label sample 1-6 on the filter paper 2.Add one drop of each sample corresponding to their number indicated on the filter paper
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Introduction Aromatic compounds‚ which are planar cyclic rings with (4n+2)π electrons‚ will not undergo simple addition reactions like those of alkyl substances. However‚ in the presence of an electrophile‚ aromatic compounds will undergo electrophilic aromatic substitution. In this type of reaction‚ two π electrons from the aromatic ring serve for the ring to act as a nucleophile and attack an electrophile. For nitration‚ this nucleophile is NO2+‚ which is produced by reacting nitric and sulfuric
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