- AStreptomyces griseus
- BStreptomyces venezuelae
- CStreptomyces fradiae
- DAll of the above
Explanation:
Streptomycin which is produced by strains of Streptomyces griseus, exhibits antibiotic activity against various Gram-positive and Gram-negative bacteria but is ineffective against the fungal pathogens of man.
Waksman isolated the antibiotic in 1943 and found it to be active against Gram-negative bacteria.
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$A$. The piece of $DNA$ would be able to multiply itself independently in the progeny cells of the organism.
$B$. It may get integrated into the genome of the recipient.
$C$. It may multiply and be inherited along with the host $DNA$.
$D$. The alien piece of DNA is not an integral part of chromosome.
$E$. It shows ability to replicate.
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