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- 1. suggest a simple procedure (or test) to veify if the final prodeuct you obtained from the extraction of casein in milk is indded casein. 2. what are the three general steps involved in isolation of proteins> discuss briefly and describe the purpose of each step. 3. what is the purpose of ethanol in the isolation of casein from milk.1. what cause the reaction of the rancid oil to ph paper to be different from that fresh oil 2. what is the chemical significance of rancid oil 3. what is the principle involved in the development of rancidity ? what are the stages in the development of rancidity. 4.define emulsifcation and surface tension. 5. cite some biological significance of emulsification and surface tension 6. what is the significance of the bromine test ? explain the meaning of the results . 7. explian the differences in the number of drops of liquid delivered using the same 1ml pippete1. What is the importance of using freshly prepared KOH? 2. What is the chemical constituent responsible for the acid-fast property of Mycobacterium species?
- 1. What is this lipid structure, give its role/ function, and enumerate its hydrolysis products or components. 2. Explain which hydrolyzed component will be positive in the Acrolein test? Ninhydrin test?4. Bacterium Q had the lab results below. What can you tell me about the protein metabolism of this bacterium? Which protein and amino acids can it catabolize, among gelatin, urea, phenylalanine, sulfur-containing amino acids and tryptophan? ________________________________________________ Can it desulfur proteins? _______________________________________ Can it produce NH3 from the amino acid phenylalanine?. A certain medium has the following composition: Glucose 15 g Yeast extract 5 g Peptone 5 g KH2PO4 2 g Distilled water 1,000 ml Tell what chemical category this medium belongs to, and explain why this is true. How could you convert Staphylococcus medium (table 3.6A) into a nonsynthetic medium? a. Name four categories that blood agar fits. Alpha hemolysis Beta hemolysis Gamma Alpha prime Name four differential reactions that TSIA shows. Observe figure 3.15. Suggest what causes the difference in growth pattern between nonmotile and motile bacteria. Explain what a medium that is both selective and differential does, using figure 3.18. a. What kind of medium might you make to selectively grow a bacterium that lives in the ocean? MSA Mannitol salt agar One that lives in the human stomach? Why are intestinal bacteria able to grow…
- 1. Why must the solution to be tested with ninhydrin be neutral? 2. Are Xanthoproteic and Millon Nasse tests satisfactory for use in the urinary examination for protein? Why? 3. Which test can be used to show up to what stage the hydrolysis of a protein proceeds? Why?Bacterium Q had the lab results below. What can you tell me about the protein metabolism of this bacterium?which protein and amino acids can it catabolize, among gelatin, urea, phenylalanine, sulfur-containing amino acids and tryptophan? Can it desulfur proteins? Can it produce NH3 from the amino acid phenylalanine?1: Why we must used calibrated dropper in preparing digoxin elixir? 2: Why we should use glycerine and alcohol mixture in preparing phenobarbitol elixir?
- Each of the following statements concerning penicillin is correct EXCEPT: a. Penicillin is a bacteriostatic drug because autolytic enzymes are not activated. b. Penicillin inhibits transpeptidases, which are required for cross-linking peptidoglycan. C. The structure of penicillin resembles that of a dipeptide of alanine, which is a component of peptidoglycan. D. An intact β-lactam ring of penicillin is required for its activity.1. Give the importance of carbohydrate fermentation test in biochemical testing and enumerate the enzymes that are involved. (5 points) 2. What are the substances added in the culture media utilized by the organism producing hydrogen sulfide? Give 2 other media used for the production of hydrogen sulfide. (5 points) 3. Explain the mechanism taking place in the hydrolysis of urea which leads to the formation of bluish red color. ( 5 points) 4. Discuss why human blood plasma will not always yield reliable results. (5 points)1.What the optimal pH range for Lactobacillus plantarum? Is plantarum an acidophile, neutraphile, or alkalophile? 2. LAB produce organic acids that have shown to be effective against controlling the growth of foodborne pathogens. What specific organic acid is produced by LAB during fermentation? 3.What is the optimal temperature range for Listeria monocyogenes? Is monocyogenes a psychrophile, psychrophile, mesophile, or thermophile?