MCQ
Who discovered the first antibiotic?
- AA. Fleming
- BW. Flemming
- CS. Waksman
- DLouis Pasteur
Explanation:
Antibiotics are chemical substances produced by the microorganisms that can kill or inhibit the growth of other bacteria and fungi. Alexander Fleming discovered penicillin, the first antibiotic in 1928, made from the Penicillium notatum.
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$(a)$ Euchromatin is loosely packed chromatin
$(b)$ Heterochromatin is transcriptionally active
$(c)$ Histone octomer is wrapped by negatively charged DNA in nucleosome
$(d)$ Histones are rich in lysine and arginine
$(e)$ A typical nucleosome contains $400\,bp$ of DNA helix
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