Question

Which of the following made it easier to conclude that physical contact of the cells was necessary for conjugation in Davis experiment?

(a) Filter

(b) U – tube

(c) Separate medium for different strains of bacterium

(d) Distant species of bacterium

I had been asked this question in semester exam.

My doubt is from Genetic Recombination topic in division Genetic Recombination of Drug Biotechnology

Answer 1

Right choice is (a) Filter

The explanation: After 4 hours of incubation in the medium within u tube Davis found that since the bacteria were not allowed for direct contact they could not exchange genetic material. It was the fritted glass filter that allowed the passage of the media but not the bacteria.