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- If a yellow halo is present around a colony on a mannitol salt agar (MSA) plate, the bacterium cannot ferment mannitol. true or falseAn unknown bacterium produces colorless colonies when inoculated onto an EMB plate. Predict what you would see if you inoculated that same unknown onto the Mannitol salt agar media?Is the mannitol salt agar (MSA) a complex or defined medium? Explain based on Composition. What kind of media based on what kind of microorganisms it allows to grow
- MSA (Mannitol Salt Agar) Match the description to the correct Bacterium A= growth, agar is yellow B= Growth, agar is not yellow C= no growthA microbe is growing on Sabouraud dextrose agar, which has a slightly acidic pH. Which of the following is this microbe likely to be? a Gram-negative bacterium an acid-fast bacterium a fungus a Gram-positive bacteriumBacterial cells can form colonies on the following media EXCEPT: Select one: Nutrient broth Agar slant Agar plates Agar deep
- S aureus Styphimurium S aureus S typhimurium Nutrient Agar Plates MacConkey Agar Plates S epidermidis Unknown S epidermidis Unknown S aureus S typhimurium S aureus S typhimurium Mannitol Salt Agar Plates Gram Stain S epidermidis Unknown S epidermidis UnknownBelow is an image of 3 different bacteria, letter labeld, growing on MacConkey Agar. Note that bacteria such as E. coli use mixed acid fermentation, with very high acid production which will cause a colored precipitation around colonies on MacConkey agar. MacConkey Agar CWhich of the following media selects for gram negative bacteria by inhibiting the growth of gram positives that typically incorporate its dye component into their relatively bigger cell walls? blood agar EMB Mannitol salt agar Simmon citrate agar urease broth
- If you suspect that your microbial culture growing in nutrient broth is contaminated, what can you do to confirm this?During media preparation, you observed that the agar medium did not solidify after sterilization even after incubating it for 1 hour at room temperature. What could be the reason behind this?In a bacterial culture on an agar plate, what is a zone of inhibition? An area where the growth of bacteria is increased compared to the rest of the agar plate An area where the growth of bacteria is prevented or reduced compared to the rest of the agar plate An area where the growth of bacteria is not affected compared to the rest of the agar plate An area where the the agar becomes contaminated with mold