The term psychrophile? a. refers to an organism that has an optimum growth within the range of -5 to 20oC   b. refers to an organism that has an optimum growth at near neutral pH c. refers to an organism that has an optimum growth between 50 and 80oC

As a technologist in the brewing industry, your job is to research and develop ways to improve the yield and quality of brewed beverages. You are responsible for growing and maintaining the particular strain of microorganism that is used in the fermentation of beverages. Name 2 environmental factors that would affect the growth of this organism and which you will need to optimize for abundant growth of your organism.

Does the "lag" phase always occur during microbial growth? Explain.

Two bacterial species have generation times of 20 min and 18 hours respectively. From the below list, choose all true statements. A. The 2nd species must not be at the optimal temperature for its growth B. different species may have very different generation times  C. optimal culture conditions may not have been used for one or both species D. stationary phase will be reached much faster with the first species

Calculate the doubling time of a culture of E. coli that is started with 3x105 CFU/mL and grows to 4.6x108 CFU/mL in 3 hours. Be sure to use units in your answer.

Based on the growth curve, which ONE of the following best describes what would happen if sample of culture in the presence of drug B is inoculated onto drug-free growth medium?   Select one: A.   Growth present, but cell count increased by at least 99.9% of the original culture   B. No growth after 24 hrs C. Growth at 24 hrs D. Not possible to predict because the culture could either be alive or dead E. Growth present, but cell count reduced by at least 99.9% of the original culture

Consider the culture type in which growth was distributed throughout the entire medium and explain why the growth was more abundant toward the surface of the medium in some cultures, whereas other cultures showed an equal distri- bution of growth throughout the tubes. 5.

Spores and toxin-producing microorganism produce toxins need higher Aw than minimum Aw for microbial growth. How could food industry benefit from this fact?

What is the proper term for an organism whose optimum growth range is between 20 and 50C but can grow well at refrigerator temperatures? a. psychrophile b. psychrotroph c. hypophiles d. psychrobot

Which has a greater impact on the survival of an organism, temperatures above its maximum temperature or temperatures below its minimum temperature? Explain why and how this relates to typical methods used to control microbial growth.