If you had a liquid culture of Staphylococcus aureus and transferred 2ml to test tube “R”, which contains 8ml of nutrient broth, what would be the final dilution (in simplest terms) of the culture in test tube “R"? From the culture in “R” make a 1:15 dilution in tube “S”. What is the final dilution of the culture in tube “S”?
You are given a milk sample that Mr. Milkman claims contains 3.8 x 10^8 CFU/ml. He claims this is within the limit of acceptable CFU/ml for Grade A milk. Diagram a procedure he could use to determine the CFU/ml and information pertinent to proving or disproving Mr. Milkman’s claim. Is the milk within the acceptable limit? ...continues
Volume & Concentration Problem
I have 100mls of an antibiotic stock solution at a concentration of 6mg/ml. I would like a final volume of 10mls of the antibiotic at a concentration of 1.5mg/ml. How much of the stock solution do I need to obtain this?
See attached file for full problem description. 1. ATP releases its energy by a. Activating its protons to form ions. b. Absorbing heat from the environment. c. Combining with other ATP molecules. d. Splitting into a phosphate and ADP. 2. A governing principle of fermentation is that a. ATP is not produced. b. Interm ...continues
Please confirm correctness of answers to the attached questions. 2. The diagnosis of tuberculosis is aided by a. Observation of cells with bipolar staining in the blood. b. Recovery of acid fast rods from the sputum. c. A skin rash on the palms and soles. d. A positive Weil-Felix test. 22. A child suffering from re ...continues
Please confirm correctness of my answers for the 3 questions. 8. Anthrax may be treated with antibiotics because a. Anthrax spores germinate into vegetative cells. b. Anthrax spores are susceptible to antibiotics. - My answer c. The spores remain dormant during disease. d. Anthrax on infects the brain. 29. The orga ...continues
Please confirm correctness of the attached questions. 2. Detergent antiseptics inactivate viruses by a. dissolving the envelope of enveloped viruses. b. Altering the nucleic acid of RNA viruses. c. Disrupting the capsid of all viruses. d. None of the above (A-C) is correct. 3. Interferon’s are produced by a. Viru ...continues
Please confirm correctness of the attached 8 questions. 1. Yeasts produce mainly by a. Conidia b. Budding c. Sporangia d. Basidia 13. The retrovirus that leads to AIDS a. Has no enveople b. Contains RNA in its genome. c. Uses reverse transcriptase to convert DNA to RNA. d. Multiplies only within the brain cell ...continues
Please review the 5 questions for correctness. There were a couple that I was unable to answer. 5. Cyst formation by certain protozoa permits a. Survival in the arthropod vector. b. Enhanced reproduction by the protozoan. c. Passage through the stomach acid. d. Using carbon dioxide as an energy source. 16. An amoeb ...continues
What kind of differences do you see when examining a specimen under a compound microscope vs a stereoscopic scope?
