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Nucleotides and Nucleosides

Bacteriophage...

Question

Bacteriophages were discovered by

A

Frederick W. Twort

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B

De Herelle

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C

Takahashi and Rawlins

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D

Both A and B

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Solution

The correct option is B Both A and B
Bacteriophages are also termed as bacteria virus.
These viruses infect bacteria and also replicates within bacteria. They were discovered by Frederick W. Twort (from Britain) and Felix De Herelle (from France).
Takahashi and Rawlins are related to studies on Tobacco Mosaic virus.
The correct answer is D.

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Q.
Who discovered bacteriophages?

Restriction enzymes were discovered by microbiologists who were studying the host range of infectious bacteriophage. The term restriction refers to the fact that different strains of bacteria are resistant to bacteriophage infection if they contain the appropriate endonucleases that can destroy infecting DNA. Observe this figure and answer the following questions.

What are structures labeled A and B respectively?

Q. Which of the following statements about the Hershey- Chase experiment are incorrect?
I: Bacteria infected with bacteriophage radiolabeled with

^{35} P

were radioactive
II: Bacteria infected with bacteriophage radiolabeled with

^{35} S

were radioactive
III: Bacteria infected with bacteriophage radiolabeled with

^{32} P

were radioactive
IV: Bacteria infected with bacteriophage radiolabeled with

^{35} P

^{32} S

were radioactive
V: Bacteria infected with bacteriophage radiolabeled with

^{35} P

were not radioactive

Restriction enzymes were discovered by microbiologists who were studying the host range of infectious bacteriophage. The term restriction refers to the fact that different strains of bacteria are resistant to bacteriophage infection if they contain the appropriate endonucleases that can destroy infecting DNA. Observe this figure and answer the following questions.

Can you pick up from figure, how the bacteria protects its own genome from degradation by restriction endonucleases?

Q. Streptomycin and actinomycin were discovered by

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