- ATetramycin
- BNeomycin
- CPenicillin
- DStreptomycin
Explanation:
The first antibiotic discovered was called as Penicillin by Alexander Fleming in 1928 from Penicillium notatum. It is the antibiotic which inhibits the growth of bacteria and it was first used to treat the infection of Streptococcal septicemia.
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$(1)$ Zooplanktons are primary producers in an aquatic ecosystem.
$(2)$ Decomposition is largely an oxygen requiring process.
$(3)$ In a natural ecosystem, fishes, wolf, etc. are carnivore.
$(4)$ The amount of energy decreases in each successive trophic level.
$I$. Lymphocytes are obtained from the patients
$II$. Lymphocytes are transferred to the culture dishes
$III$. Lymphocytes are transfected with the normal $ADA$ genes
$IV$. The transfected cell are returned to the patients
The chronological order should be
$I$. To study the normal physiology and development
$II$. To study diseases
$III$. To obtain useful biological products
$IV$. To test the vaccine safety
$V$. To test the chemical safety
Which of the above statements are correct?
