Choksi Laboratories Interview Questions and Answers

E. coli is a type of bacteria commonly found in the intestines of humans and animals.

• E. coli can be both harmful and beneficial, depending on the strain.

• Some strains of E. coli can cause food poisoning, while others are used in the production of certain foods like cheese.

• E. coli is often used as an indicator organism in water quality testing.

• Antibiotic-resistant strains of E. coli are a growing concern in healthca...read more

Water analysis/testing is the process of examining water samples to determine their chemical, physical, and microbiological properties.

• Water analysis involves testing for contaminants such as heavy metals, pesticides, bacteria, and viruses.

• Common methods used in water analysis include pH testing, turbidity measurement, and microbial enumeration.

• Water testing is crucial for ensuring water quality and safety for con...read more

Bio assay is a method used to determine the potency or concentration of a substance by measuring its effect on living organisms.

• Bio assay involves using living organisms to measure the biological activity of a substance.

• It is commonly used in pharmaceutical and environmental testing to determine the effectiveness of drugs or the toxicity of chemicals.

• Examples of bio assays include using bacteria to test the effect...read more

Gram staining is a technique used to differentiate bacteria into two groups based on their cell wall composition.

• Gram staining involves staining bacterial cells with crystal violet dye, iodine solution, alcohol decolorization, and safranin counterstain.

• Gram-positive bacteria retain the crystal violet dye and appear purple under a microscope.

• Gram-negative bacteria lose the crystal violet dye after alcohol decoloriz...read more

Confirmatory tests for pathogens include biochemical tests and the IMViC test.

• Biochemical tests are used to identify specific metabolic activities of pathogens.

• IMViC test is a series of four tests (Indole, Methyl Red, Voges-Proskauer, Citrate) used to differentiate between Enterobacteriaceae species.

• Results of confirmatory tests help in accurate identification of pathogens for appropriate treatment.

• Examples of bio...read more