Q. What is the correct order when coliphage P1 is grown in a thr+ leu+ aziR host is used to infect a thr- leu- azi- recipient bacterial cell?

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Q. How many percent of thr+ transducing phages also carry leu+?

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

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Q. What are the characteristics of rough pneumococci strain?

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Q. In Griffith’s experiment which of the following strains of pneumococci was isolated from dead mice?

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

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Q. We require cell-free DNA for transformation to take place.

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

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Q. How many DNA molecules are transferred after each transformation?

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

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Q. Which among the following species have not been transformed?

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Q. In which phase of growth does the recipient cell takes up the donor DNA?

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Q. The DNA uptake process does not require any energy.

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Q. Which of the following was the first amino acid to be produced commercially?

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Q. The Candida species require fermentation equipment lined with plastic because they are extremely sensitive to

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Q. Cycloserine may be isolated from the cultures of

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Q. The first penicillin isolated by Alexander Fleming, penicillin F is also called

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Q. It is mandatory that cultures and fermentation residues be sterilized before discard in case of Eremothecium ashbyii and Ashbya gossypii because they are

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Q. Which of the following when used in proper concentration stimulates the Ascomycetes fermentation of vitamin B12 and can be used to counteract toxicity of iron in Candida species?

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Q. Pectinase, an enzyme used for increasing yield and for clarifying juice is obtained by

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