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Kaplan Qbank USMLE



Author5 Posts
  #1

are spores metabolically active or inactive

  #2

Spores are small, highly resistant, metabolically inactive structures which develop as a response to depletion of nutrition. These can remain dormant for many years and are extremely resistant to chemical and physical disinfection..Spores are able to germinate when external conditions are favourable, particularly when there is moisture and nutrients such as amino acids, pyrimidine or sugar.. These then absorb water, swell, spore coat ruptures and a new vegetative cell grows out. Hope this was useful..

  #3

thanks, i was thinking that they have a very low level of metabolica activity because no metabolic activity did not make sense

  #4

They're reactivated by water. What you gotta realize about bacterial spore is that they're not reproductive structure like fungi spores or plant pollen - they're just a double cell wall structure with some bacterial genetic material and few enzymes preserved by things like muramic acid - and they reactivate when they encounter water and favorable temperature and then the enzymes reactivate and a bacteria regrows.

  #5

that was well explained, thanks a lot







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