3 questions on "Microbial Growth and Its Control - Osmolarity and Microbial Growth"

What are extreme halophiles?

Extreme halophiles require high levels (15–30%) of NaCl for growth (30% = 300 g/L).
What are compatible solutes?
Compatible solutes are highly water-soluble organic molecules and include sugars, alcohol, and amino acid derivatives.
How is the osmotic pressure in the surrounding environment fought?

Mechanisms for combating high osmotic pressure in surrounding environment involve increasing the internal solute concentration by:
  • Pumping inorganic ions from environment into cell
  • Synthesizing or concentrating organic solutes (compatible solutes)
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