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- Which of the following pairs is mismatched? a. catalase: hydrogen peroxide production b. bactericidal permeability-increasing protein: binds LPS and kills Gram-negative bacteria c. elastase: basement membrane degradation d. NADPH oxidase: superoxide radical production e. gelatinase: iron sequestration f. paracrine: acts on neighboring cells.Cell membranes are not permeable to anthocyanin. If the anthocyanin appears in the solution, what must have occurred?Glucose broth is a liquid medium used for the isolation and cultivation of different microorganisms. Glucose broth usually contains glucose, peptone, and sodium chloride. If glucose is completely depleted in the broth, will the cell metabolism stop immediately? Why or why not?
- A bacterial culture contains 500 cells/mL in the exponential growth phase at 8 AM. If you onsider a generation time of 20minutes, what will be the total number of cells/mL after three hours?If the bacteria within your medium suddenly die, can an alteration in osmotic balance be the reason why?When transpeptidation is inhibited by beta-lactam antibiotics, bacteria can still synthesize components of the cell wall, but they will fail to maintain structural integrity under osmotic pressure. True or False?
- What part of a cell would be considered the hazmat crew ( detoxifies waste) ?Two cultures of a facultative anaerobe are grown in the same medium, but one culture is exposed to air and the other is maintained under anaerobic conditions. Which of the two cultures will contain more cells at the end of a week? Why?A microbe cannot grow without using enzymes. Explain why bacteria are limited to growth within a given temperature range. Explain why bacteria are limited in growth within a specific pH range.
- Why would cells that are vigorously growing when inoculated into fresh culture medium have a shorter lag phase than those that have been stored in a refrigerator?A paramecium cell placed into a hypotonic solution will experience which of the following effects? expulsion of the excess water using its contractile vacuoles plasmolysis hemolysis shrinkage crenationWhich process requires energy—passive or active transport? Why is energy sometimes required to move solute across the cell membrane?