Quorum sensing represents a method by which bacteria can measure what? Choose one: the size of a prospective host the size of their populations external pH osmolarity temperature O O O o O
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- Figure 22.8 Compared to free-floating bacteria, bacteria in biofilms often show increased resistance to antibiotics and detergents. Why do you think this might be the case?Figure 22.16 Which of the following statements is true? Gram-positive bacteria have a single cell wall anchored to the cell membrane by lipoteichoic acid. Pori ns allow entry of substances into both Gram-positive and Gram-negative bacteria. The cell wall of Gram-negative bacteria is thick, and the cell wall of Gram-positive bacteria is thin. Gram-negative bacteria have a cell wall made of peptidoglycan, whereas Gram positive bacteria have a cell wall made of lipoteichoic acid.what does the term dCs/dx mean in the Ficks equation (can be multiple equation) - solute flux -concentration gradient -solute concentration -diffusional coefficent -change in solute concentration over distance
- Relate the terms presented in the first column with the information in the second column; i. Temperatureii. face speediii. Relative humidityiv. Transport and storage timev. Exposure time and concentration of pollutants (__) May influence the integrity of the sample;(__) Influence the amount of sample collected(__) Defines the choice between a sampler containing hydrophilic adsorbents or one with hydrophobic adsorbents.(__) Influences the effective length of the diffusion path.(__)Variation in sampling due to its influence on the diffusion coefficientExplain what would occur to a bacterial cell placed in a salt concentration of 10%, that normally functions in a salt concentration of 0.85%. – remember to use the term osmosis and osmotic pressure in the responseYou plate 100 uL of a bacterial culture on an LBA plate and incubate for one day at 37 degrees Celsius. You count 100 colonies (colony forming units). What is the concentration of cells you plated (represented in units of CFU/mL)? Hint: look at the units carefully. I put 10000 last time and it was wrong!! that is all the information given... 5 cfu/mL b. 1,000 cfu/mL c. 500 cfu/mL d. 1 cfu/mL e. 10,000 cfu/mL
- Which of the following is an example of active transport? Uniporter Aquaporins Na+/K+ ATPase All of the aboveHow does the presence of high concentrations of salt orsugars in food prevent growth of microorganisms?(a) It sets up a hypotonic environment causing the cells tolyse.(b) It sets up an isotonic environment in which cells die.(c) It sets up an environmental high in osmotic pressureresulting in cellular plasmolysis (water loss).(d) a and b.(e) None of the above.Why most you use deionized water rather than tap water in this experiment? A- Tap water has many ions B- Tap water has virus C- tap water has pathogens
- Which of the following is not involved in quorum sensing?a. accumulation of inducer moleculesb. a certain level of biofilm densityc. self-monitoringd. release of genetic materialTrue or False _____h. Active transport works against the concentration gradient _____I. Sodium ions are moved across the membrane by transport proteins _____j. A cell can engulf a bacterium by bulk transport called endocytosisI need help with the diagrams for aHypertonic, Isotonic, Hypotonic, Solute