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Situation:
A burger is initially contaminated with 100 cells of bacteria.
To solve:
How many cells will there be after 3 hours of holding it at temperature danger zone?
Step by step
Solved in 2 steps
- A cell population has 10,000,000 cells and you add a disinfectant. Assume the constant D-value is 5 minutes. How many cells will be left after 10 minutes?Identify the FALSE statement from the following, if any Group of answer choices capsule plays role in transport process capsule can retain water ; cells protected against drying/ dessication capsule presence aids bacteria to better evade host defense cells capsule functions as a passive defense barrier capsule is coded by chromosomal DNA in majority of bacteria none of the above is a false statementBesides dehydrated foods, how might the amount of water available to microbes be decreased? Group of answer choices Treatment by non-ionizing radiation. Treatment at high pressures for extended periods of time. Storage at temperatures between -2 and 4 °C. Pasteurization Addition of solutes such as salt or sugar.
- Which of the following prevented an aerotolerant anaerobic, mesophilic and halophilic bacterium from contaminating your home aquarium? the water was at 37ºC you placed a high amount of glucose into the aquarium you placed several pennies in the aquarium you were using a .45 um filtering unit you placed carbon dioxide instead of oxygen into the aquariumWhich of the following is NOT a feature associated with filtration? sterilization of heat-sensitive materials use of HEPA filters to filter air ability of some filters to trap viruses and proteins nitrocellulose or plastic membrane filters varying thicknesses of membrane filters usedBelow is an image of a stained microorganism. Choose the BEST answer for the following questions pertaining to the image shown.
- As part of an experiment where absorbance values are measured using a spectrophotometer, you are taking readings of your sample every 20 minutes. The non-motile microbe you're testing has a generation time of roughly 20 minutes at an incubation temperature right around room temperature. Things start out fine, with the expected results — as time goes by at the correct incubation temperature, absorbance starts to rise as the medium starts to become more cloudy with growing microorganisms. But roughly 2 hours into the process, you notice that the absorbance levels flatten out, and then start to decrease unexpectedly. What is most likely taking place in your experiment?Assume that you are responsible for decontaminating materials in a large hospital. How would you sterilize each of the following? Briefly justify your answers. a mattress used by a patient with bubonic plague intravenous glucose-saline solutions used disposable syringes tissues taken from patientsWhich of the following pairs are not correctly matched? Select one: a. Transient flora - removed easily by hand washing b. Pathogenic bacteria - can’t be reduced by hand washing c. Resident flora - not removed by antiseptic but inhibited for 24hs d. Effective hand washing - reduction of infection
- EGG OSMOSIS (LABORATORY EXPERIMENTATION) MATERIALS: 3 glasses 3 small eggs (Quail eggs, if available) vinegar Sugar solution (1 teaspoon of sugar in 100mL of water) Salt solution (1 teaspoon of salt in 100mL of water) Distilled water (Wilkins or H2Zero) PROCEDURES: Removing of Egg Shell Carefully pour vinegar in a glass Submerge the eggs in the vinegar, make sure the eggs are cover to the surface. Soak the eggs for 24 hours. The vinegar will remove the eggs’ shells. The acetic acid in the vinegar reacts with the calcium carbonate in the shell. 2. After 24 hrs Slowly pour out the vinegar leaving a revealed membrane of the eggs. Wash the egg slowly. Measure the egg, using a tape measure. Find the circumference of the egg 3. Soaking in 3 different medium Soak the 3 eggs to different medium. 1 glass contains salt solution (label A) 1 glass contains sugar solution (label B) 1 Glass contains distilled water (label C) Leave it for 24 hours 4. After Soaking…EGG OSMOSIS (LABORATORY EXPERIMENTATION) MATERIALS: 3 glasses 3 small eggs (Quail eggs, if available) vinegar Sugar solution (1 teaspoon of sugar in 100mL of water) Salt solution (1 teaspoon of salt in 100mL of water) Distilled water (Wilkins or H2Zero) PROCEDURES: Removing of Egg Shell Carefully pour vinegar in a glass Submerge the eggs in the vinegar, make sure the eggs are cover to the surface. Soak the eggs for 24 hours. The vinegar will remove the eggs’ shells. The acetic acid in the vinegar reacts with the calcium carbonate in the shell. 2. After 24 hrs Slowly pour out the vinegar leaving a revealed membrane of the eggs. Wash the egg slowly. Measure the egg, using a tape measure. Find the circumference of the egg 3. Soaking in 3 different medium Soak the 3 eggs to different medium. 1 glass contains salt solution (label A) 1 glass contains sugar solution (label B) 1 Glass contains distilled water (label C) Leave it for 24 hours 4. After Soaking…Which of the following factors is NOT significant in determining the effectiveness of a microbial treatment? Group of answer choices The toxins secreted by the microbe being treated. The susceptibility of the microbe to the treatment. The concentration of the treatment. The length of exposure to the treatment