Short chains of gram-positive coccus-shaped bacteria

Tiny little colonies grow on your EMB agar during the confirmed test in water assessment testing. When you Gram stain, these bacteria turn out to be short chains of gram-positive coccus-shaped bacteria. What do you think? Multiple Choice The water sample contains some gram-positive bacteria that can grow on EMB These are mutant E. coli colonies. There is fecal Staphylococcus aureus in the water sample, There are spore-forming bacteria in the water sample. Pasteurization is very different from other heat methods used to kill microorganisms. How? Multiple Choice The temperature of pasteurization is always much lower than other heat methods. O Other heat methods are sterilization methods, whereas pasteurization is not O Pasteurization kills as well as other heat methods, but the time is much quicker.

All of these statements are correct. Placing a 1 ml sample of raw milk into a 99 ml sterile water, then transferring an Iml sample from that dilution to another 99 mi sterile water produces a. dilution Multiple Choice tho 1700 17,000 170,000 1/100.000 You have been taking water samples out in the environment and filtering them with a membrane filter apparatus, using a 0.45-micron filter. The filters are collected and placed on an agar medium plate, to be incubated at the appropriate temperature when you return to the lab. Along the way, you have been camping to save money, but now you find that you are out of clean water to drink. You are thinking about filtering the stream water through the filter apparatus so that you have potable water. Which is the correct answer? Multiple Choice The water is not drinkable because only a few bacterial types, mainly coliforms, get filtered out of the water The water is drinkable because it is now sterile The water will have viruses in it because they are smaller than the filter pore size, but at least the water is bacterial-free You need a much smaller pore size in your filter to remove the bacteria from the water