MacConkey agar is a selective and differential culture medium. It is selective because it contains crystal violet and bile salts which inhibit the growth of Gram-positive bacteria, therefore selecting for the growth of Gram-negative bacteria. It is also differential bec...
The external structures of bacterial cells vary per species and each type of structure is made for a specific function that helps the bacteria thrive and survive. Learn about the different types of bacterial structures such as the pili, fimbriae, flagella, glycocalyx, and their specific functions...
This type of media is soft; hence, it allows the mobility of microorganisms inside the medium. This, it can be used to separate motile microorganisms from non-motile ones. Solid Media This type of media contains added agar in order to solidify the medium. Here, the growth of microorganisms ...
What pathogen (Staphylococcus epidermidis or E. coli) is able to grow on a MacConkey Agar plate and why? Is this type of agar serving as differential, selective, or both? Explain why. What antibiotic is used for bacterial pneumonia? What is doubling time in bacterial growth? What antibiotic...
Suppose a mistake is made in preparing a batch of EMB agar and the starting pH is 7.6 instead of 6.9 - 7.3. Would that affect the medium's sensitivity or specificity? Explain. In Biology, what is a controlled experiment? a. What fac...
What are the roles of neutral red and lactose in MacConkey agar? What is lac operon? How does it work? When there is little or no lactose present in a bacterium s environment, then the gene for the lactose transport enzyme is not trans-...a...