MCQ
Streptomycin is produced by:
- 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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$(a)\; DNA$ is negatively charged molecule and so it is loaded on gel towards the Anode terminal
$(b) \;DNA$ fragments travel along the surface of the gel whose concentration does not affect movement of $DNA.$
$(c)$ Smaller the size of $DNA$ fragment larger is the distance it travels through it.
$(d)$ Pure $DNA$ can be visualized directly by exposing UV radiation.
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