Question 21 of 25 What are Gram-negative bacteria? Select the correct response(s): They have a cell wall made-up of a thick layer of peptidoglycan and with carbohydrate-lipid complex. ✓ They have a cell wall made-up of a thin layer of peptidoglycan and with protein-carbohydrate complex. They have a cell wall made-up of a thick layer of peptidoglycan and with protein-carbohydrate complex. They retain crystal violet dye and thus are stained purple. They cannot retain safranin and are stained purple by crystal violet. They have a cell wall made-up of a thin layer of peptidoglycan and with carbohydrate-lipid complex. ✓ They cannot retain crystal violet dye and are stained pink by safranin.
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- Question 7: How could immunotherapy be used to kill superbugs and how would this therapy distinguish between bacterial cells and human cells?Question:- 1. What is catalase and why do some microorganisms have it? Name two other types of bacteria that are catalale positive (you cannot use Staphylococcus spp.)Question 5 You spread a small amount of a water sample from the environment on an enriched media agar plate. After 24 hours, the plate is covered with many small yellow colonies. Does this plate contain a pure culture of bacteria? ○ No, because it came from the environment, there are lots of different organisms. ○ We know there are multiple species present, but each colony is a different species. ○ Yes, we know the plate contains a pure culture because there are individual colonies. ○ We do not know if the plate contains a pure culture or a mixed culture. or even if individual colonies are pure or mixed based on their appearance alone.
- Question 68Chlamydia trachomatis is a: Question 68 options: a) Gram-negative, obligate intercellular bacteria b) Gram-negative facultative intracellular bacteria c) Gram-negative, obligate intracellular bacteria d) Gram-negative, facultative intercellular bacteriaQuestion 6 Which of the following is the correct sequence for the aseptic transfer of a bacterial culture? - 1. 2. 3. 4. 5. 6. 7. Remove the lid of the media receiving the culture & flame the mouth of this tube. - 1. 2. 3. 4. 5. 6. 7. Flame the mouth of the culture tube. - 1. 2. 3. 4. 5. 6. 7. Insert the wire loop with the culture to inoculate the bacteria on or in the new media. - 1. 2. 3. 4. 5. 6. 7. Reheat the mouth of the culture tube and replace the cap. - 1. 2. 3. 4. 5. 6. 7. Sterilize the loop by heating it from base to tip uniformly orange-hot. - 1. 2. 3. 4.…Topic 1: Gram staining principle a. Describe the structure of peptidoglycan b. Describe in detail the architecture and structure of Gram negative cell wall structure c. Discuss how Gram positive cell wall is different from Gram negative wall structure. d. What are teichoic acid and their location? Provide the role of the teichoic acid in bacterial cells.
- QUESTION 41 You are doing research on a bacterium that undergoes gliding, not surprisingly you note the bacterium produces what? • A. capsule • B. hamus/hami • C. slime layer D. surface array layer (S layer) • E. stalkQuestion 8 How did we determine the degree of bacterial growth? 1. We approximated the number of colonies 2. we compared the weight of the plates before and after incubation 3. we watched for a color change in the agar 4. we watched for the release of metabolic gasesQuestion 14 When quantifying the amount of lipid in milk, an aliquot of milk is mixed with organic solvent and spun in a centrifuge. Three layers are observed in the tube after centrifugation. In which layer would you expect to contain the lipid component of milk? Aqueous layer at the top White middle layer Bottom solvent layer Question 17 Which of the following are true of cardiolipin? Tick all correct answers. It has four hydrocarbon tails. It has three glycerol molecules present in the structure. It has two hydrocarbon tails. It is a phosphoglycerolipid. It has only one glycerol molecules present in the structure. Question 19 Which of the following molecules are common in the head groups of phospholipids? Tick all correct answers. lysine choline serine glucose ethanolamine galactose
- QUESTION 20 You are studying the effects of removing integrins from cells. Which of the following abilities is the cell most likely to lose? A The cells are going to lose their ability to make connections with the ECM. B The cells will lose their ability to secrete growth factors. C The cells are going to lose their ability to form cell-cell adhesions. D The cells are going to lose their ability to communicate with the cytoskeleton.multiple choice question which choice is the best example of an extracellular protein with chains held together by S-S bond ? (a) hexokinase (b) transfer RNA (c) immunoglobin (d) histone H1 (e) hemoglobinquestion 11 Explain the role of streptomycin in the lab. 1. Streptomycin was the bacteria to which we applied the antibiotic 2. Streptomycin refers to the spreading process that precedes incubation. 3. Streptomycin is the growth medium that bacteria require to grow. 4. Streptomycin was the antibiotic to which we exposed the bacteria