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Q1 How can you measure the activity of actinomycetes that produce
antibiotics ?
Q2 What is the reason of the production of clear zone around the proteolytic
bacteria when grown on casein agar ?
Q3 Why some bacteria produce Nanoparticles when grown on trace elements?
Q4 Why the ureolytic bacteria use urea? And why they produce CaCO3?
Step by step
Solved in 3 steps
- 1. What is host resistance in bacteria? 2. What is gram staining technique? 3. Difference between lysosomes and peroxisomes. 4. What are microtubules in cell? 5. Define endoplasmic reticulum, mitochondria, cytoskeleton, ribosomes, vesicles, golgi apparatus, chloroplasts, vacuole, pili and fimbriae, transcription, plasma membrane, cytoplasm, DNA 6. Meaning of primitive cells.6)Which of the following statements is a reason why Acid-Fast Bacteria resist the Gram stain a) Because their cell wall architecture varies from both gram-negative and gram-positive bacteria. b) Because they lack the peptidoglycan layer. c) Because they have a thick peptidoglycan layer. d) Because they have a thick layer of fatty acids.Bacteria of the genus Mycoplasma are distinguished from other bacterial cells by 1) cell walls composed solely of amino acids. O 2) the absence of a cytoplasmic membrane. O 3) the absence of a cell wall. O 4) Have large capsules. 5) the presence of mycolic acid in their cell walls.
- In a certain culture of bacteria, the rate of increase is proportional to the number present. (a) if it is found that the number doubles in 6 hours, how many may be expected at the end of 18 hours? (b) If there are 10^2 at the end of 4 hours and 8(10^2) at the end of 8 hours, how many were at the beginning?Biofilms represent an important environmental niche. A) How does growth on a surface differ from growth in a suspended laboratory culture? (In other words: How do biofilm-forming cultures differ from planktonic cultures) B) Describe the stages of biofilm development including cellular and extracellular components? C) What processes regulate might regulate biofilm formation? Is quorum sensing involved and if so, how common is it? D) Why would biofilms promote the formation of genetic variants? What are the mechanisms by which this might occur? These questions are all related.22) Which of the techniques/characteristics below may be used to identify a target bacterium in a pool of microorganism? ( a) its morphology () b) its growth requirement c) antibody-antigen interaction d) all of the above. ( e) a and c 23) What is the process that produces alcohol in S. cerevisiae (yeast)? ( a Respiration ( b) Sedimentation c) Photosynthesis ) d) Fermentation
- Which among statements A-D is not applicable to endospore formation? A) O It is likely to occur during the log phase of growth. B) O Formation of a mother cell occurs during the process. C) OIt is a property found in members of genus Bacillus and genus Clostridium. D) O Dipicolinic acid and calcium ions play an important role in making the spore highly resistant to environmental conditions, E) OA-D are all are applicable to endospore formationAnswer the following questions briefly and concisely 1.How do bacteria in a chemostat and those in a batch culture vary from one another? 2. What happens in a chemostat if the dilution rate is higher than the organism's maximum specific growth rate? 3.Does a chemostat require the use of pure cultures? 4. Why would a complicated culture media for Leuconostoc mesenteroides be simpler to make than one with a fixed chemical composition?Q5) What genus of bacteria is most likely to produce antibiotics? Q6) How could you tell if antibiotics are actually produced? Describe for me what was done in the lab to confirm this.
- I am doing my microbiology homework and I need help with these questions: 1) List the structures ALL bacteria possess. 2) Identify three structures SOME but not all bacteria possess. 5) Describe the structure and function of three different structures found outside of the bacterial cytoplasmic membrane. 6) Differentiate between the two main types of bacterial envelope structures. 7) Why are Gram-positive cell walls stronger than Gram-negative cell walls? 8) Name a substance in the envelope of SOME bacteria that can cause severe symptoms in humans. 9) Describe the causes of sporogenesis and germination 10) Compare and contrast the major features of archaea, bacteria and eukaryotes by completing the table below. Characteristic Bacteria Archaea Eukarya Chromosome Type of Ribosomes Protein Synthesis Similar to Eukarya Sterols In Membrane Membrane-bound Organelles Peptidoglycan in Cell wall1. What color does an acid-fast cell stain? 2. Identify two diseases that are caused by acid-fast bacteria. 3. In the endospore stain, what color do the endospores stain? 4. If you performed an endospore stain on Mycobacterium, what color cells would you expect tosee? Why? 5. How do capsules contribute to virulence of an organism? 6. Since you know what lophotrichous and amphitrichous arrangements look like, put thoseterms together to draw an amphilophotrichous bacterium. 7. Streptococcus pneumoniae that are capable of causing pneumonia are encapsulated bacteria(meaning they have a capsule). Describe what you would expect to see under themicroscope after performing a capsule stain with india ink and safranin.what is plaque essay? what is the purpose of this lab? why this lab is perform? (bacteriophage) what techniques is used and how can we derive information(data)? methologies, theory, mechanism for reactions that lead to observable results. required information on microbial metabolism. why is the microbe doing this?