In conjugation only small fragments of the bacterial chromosome are transferred.

What is the shape of DNA in the male cells of E.coli?

The F factor DNA is sufficient to specify how many genes?

Bacteriophages inject their nucleic acid into the bacterium.

When the phage transduces only those bacterial genes adjacent to the prophage in the bacterial chromosome then it is known as?

Which of the following things was identified as the transforming principle?

What should be the minimum weight of DNA that is required for a successful transformation?

How many DNA molecules are transferred after each transformation?

Which of the following enzymes acts on the DNA after its entry into the cell?

In which phase of growth does the recipient cell take up the donor DNA?

The DNA uptake process does not require any energy.

Animals that are contaminated with germs are said to be gnotobiotic.

How many day-old embryonated eggs were used by Reyniers to rear first germ-free animals?

Which among the following was the first germ-free animal to be reared?

Which of the following vitamins are not required by normal animals?

Germ-free animals require lower levels of B vitamins.

Pseudomembranous colitis is caused by the strains of which of the following microorganism?

Where does the Streptococcus mutans adhere to the body site?

Which of the following microorganism produces colicins in the intestine?

Bacteria can be grown on the dry surface of skin.

Which of the following bacteria are found in the nose?