Bacterial Genetics — MCQs

The initial origin of new drug resistance genes in bacteria most commonly occurs due to:

All the following terms are used to describe bacterial chromosome Except

Which statement is false regarding the LAC OPERON MODEL?

The most common mechanism of resistance to drugs in Staphylococcus is

What is the primary use of the freezing method in microbiology?

In microbiology, exaltation refers to -

Which of the following statements about Corynebacterium diphtheriae is NOT true?

A 25-year-old male from a flood-affected area presents with sudden onset of profuse, painless, rice-water diarrhoea and severe dehydration. Stool is collected and inoculated onto selective media. The plate after 18 hours of incubation at 37°C is shown (Image 1). Which single biochemical or growth characteristic of the organism forming these colonies best explains why this selective medium differentiates it from non-pathogenic vibrios such as Vibrio parahaemolyticus?

Which of the following infections can be transmitted to a baby during delivery?

2x10^2 Streptococcus viridans are inoculated into a flask containing one liter of enriched broth. If the lag time is 30 minutes and the generation time is 20 minutes, how many bacteria will there be in the culture after two and a half hours?