Question

An organism has an optimal growth rate when the hydrogen ion concentration is very high. This organism is
A.osmotolerant
B. acidophile
C. neutrophile
D. aerotolerant anaerobe

Answer 1

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Answer 2

Answer:

Option B - Acidophile

Explanation:

• Acidophilic organisms are an economically and ecologically important group.
• They occur in acidic natural (sulphuric pools) or man-made (Acid amine drainages) environments.
• They possess networked adaptations for regulating intracellular pH.
• Extracellular enzymes from acidophilic microbes are also known to be functional at lower pH than that inside the cells.
• These acid-stable enzymes are very useful in several industries like baking, fruit juice processing, animal feed, starch, and pharmaceuticals.  
• They are widely used in the bioleaching of metals from low-grade ores.
• Acidophiles are used in bioconversion and bioremediation.
• They are also used in microbial fuel cells to generate electricity.
• Acidophiles have optimal growth at pH values near 3 whereas alkaliphiles have optimal growth at pH values above 9.

Hence, organisms that have an optimal growth rate when the hydrogen ion concentration is very high are acidophiles.