punkinrichard1oxon2i
21.02.2020 •
Biology
Clostridium botulinum is a bacterium that is not normally associated or symbiotic with humans but secretes proteins which are toxic to humans and cause botulism. Which of the following is, therefore, true of C. botulinum? it is an endotoxic pathogen it is a parasitic pathogen O it is commensal with humans O it is an opportunistic pathogen it is an exotoxic pathogen
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Ответ:
it is an exotoxic pathogen
Explanation:
The toxin which is released by the bacteria outside the cell is called exotoxin. Endotoxin is related with the lipopolysaccharide cell wall of gram-negative bacterial mostly.
Clostridium botulinum is the bacteria that produces clostridial toxin outside the cell and it causes foodborne intoxication in humans. This toxication is called botulism. Exotoxins are more lethal than endotoxin because it is very harmful even in a small dose.
Mostly the exotoxin is already present in the contaminated food and clostridium botulinum is mainly found in canned food.
Ответ:
Uracil is the nitrogenous base that exists in RNA but is absent in DNA.
Explanation:
Uracil or uracil is a nitrogenous base. Represented by the letter U in the genetic code, it is a simple, pyrimidine ring base capable of making two hydrogen bonds, just like thymine. It replaces thymine in DNA to RNA transcription to complement adenine. It is an exclusive base of RNA, that is, it does not occur in DNA.