Which of the following is false about a colony? O A colony is a population of cells formed from a single bacterlal cell or a colony forming unit. O A colony is pure and produced from one bacterial cell. Pure colonies are isolated by streaking. O A colony consist of billions of bacterial cells. O A colony is a mixture of different bacterial cells.

In the experiments below, different prokaryotic cells were grown in broth cultures in the presence or absence of an antibiotic (either vancomycin or polymixin) After 1 hour, cells were rinsed, and the percent of bacteria that survived was determined. According to the data, which experiment (A or B) was done with vancomycin and which was done with polymyxin? Explain your reasoning in both cases. 100 0 A Bacillus E. coli with antibiotic without antibiotic B Methanoge n 100 Bacillus E. coli Methanogen

The formation of _ is a positive result in the VDRL test. Group of answer choices cytopathic effect phospholipid zone of precipitation flocculant

Which of the following reports bacteria counts as colony-forming units? Turbidity Most probable number Standard plate count Microscopic counts

The bacteria that are killed are considered "selected against" True The whole statement is true. False Some of the statement is false.

Why most you use deionized water rather than tap water in this experiment?  A- Tap water has many ions  B- Tap water has virus  C- tap water has pathogens

You are given a culture medium on which only Gram negative bacteria will grow. Organisms that are capable of fermenting lactose will produce dark red colonies, while those that do not will remain colorless. This medium is best described as: O differential medium, O selective and differential medium. O selective medium. O enrichment culture. A Moving to the next question prevents changes to this answer. Question 4 of

What is a lawn of bacteria?     an uneven layer of bacteria covering an entire surface     an uneven layer of bacteria covering only part of a surface     a uniform, even layer of bacteria covering an entire surface     a uniform, even layer of bacteria covering part of a surface

Polymyxins are antibiotics that are used in the treatment of Gram-negative bacterial infections. You are given samples of two different types of bacteria. You are told that Bacteria A is Gram-negative bacteria and Bacteria B is Gram-positive bacteria. Describe, in your own words, how you would confirm the bacterial types.