Which process does not require light and involves chemoautotrophs obtaining energy from inorganic substances?

Which process does not require light and involves chemoautotrophs obtaining energy from inorganic substances?

• A. Fermentation
• B. Lactic acid fermentation
• C. Nonsense mutations
• D. Chemosynthesis

Answer: (D)

Chemoautotrophs get their energy from chemical reactions involving inorganic substances, not from light. Chemosynthesis is the process where these organisms use that chemical energy to fix CO2 into organic matter, forming their own organic compounds without sunlight. That’s why it’s the best answer here. Fermentation relies on energy stored in organic molecules like glucose and can occur without oxygen or light, but it’s not driven by inorganic chemical energy in chemoautotrophy. Nonsense mutations aren’t a metabolic process at all.

Chemoautotrophs get their energy from chemical reactions involving inorganic substances, not from light. Chemosynthesis is the process where these organisms use that chemical energy to fix CO2 into organic matter, forming their own organic compounds without sunlight. That’s why it’s the best answer here.

Fermentation relies on energy stored in organic molecules like glucose and can occur without oxygen or light, but it’s not driven by inorganic chemical energy in chemoautotrophy. Nonsense mutations aren’t a metabolic process at all.