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#colony forming units

3 public questions tagged with this topic.

Aptitude and Reasoning

A cell suspension (1.5×10 ⁵ cells per ml) was treated with 1mM HgCl2 for 30 min. After treatment, the cell suspension wa

The principle of quantitative reasoning explains that ratio, percentage and series logic determine correct calculation. Hence 0.33 fits best because it meets mathematical and logical criteria, as documented in authoritative sources on aptitude and reasoning.

Ref: Agrawal, Quantitative Aptitude for Competitive Examinations, Chapter 5, Logical Reasoning and Probability, covers ratios, percentages, series completion, time-distance and analytical reasoning explaining problem-solving strategies for competitive assessments.

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Aptitude and Reasoning - Part 2

1g of rice flour from 1kg pack is mixed in 100 ml of sterile water. Aliquot from this solution was dispensed in test tub

quantitative reasoning analysis shows ratio, percentage and series logic determine correct calculation. Consequently 25, 00, 000 cells per kg emerges as the valid choice since it meets mathematical and logical criteria, aligning with established principles in aptitude and reasoning literature.

Ref: Agrawal, Quantitative Aptitude for Competitive Examinations, Chapter 5, Logical Reasoning and Probability, covers ratios, percentages, series completion, time-distance and analytical reasoning explaining problem-solving strategies for competitive assessments.

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Microbial Physiology

The CFU/mL of a bacterial culture is calculated using the formula:

Colony forming units per milliliter provides standard measure of viable culturable bacteria assuming each colony derives from single viable unit capable of growth on agar. To achieve statistically reliable counts, serial tenfold dilutions are prepared in diluent and fixed aliquot such as 0.1 mL is spread onto nutrient agar via spread plate using sterile spreader or mixed into molten agar via pour plate. After appropriate incubation colonies are counted; ideal range 30 to 300 avoids overcrowding and sampling error. Because only diluted fraction was plated, conversion to original density require

Ref: Prescott's Microbiology, 11th ed., Chapter 6: CFU/mL Calculation and Dilution Factor Method.

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