Question

Chemoorganotrophic heterotroph organisms use

• A. Organic compounds as sources of energy, hydrogen, electrons and carbon
• B. Light energy, organic electron source and organic compounds as its carbon source
• C. Chemical energy, inorganic electron source and CO\(_2\) as its carbon source
• D. Organic compounds as sources of energy, hydrogen, inorganic compounds for electrons and carbon (This option is cut off in one image, but ends like this in another)

Hint:

• Metabolic classification based on:
  • Energy source: Chemo- (chemical), Photo- (light).
  • Electron source: -organo- (organic), -litho- (inorganic).
  • Carbon source: -heterotroph (organic), -autotroph (CO\(_2\)).
• Chemoorganoheterotrophs use organic compounds for energy, electrons, and carbon (e.g., humans metabolizing glucose).

Answer 1

The Correct Option is A

Chemoorganotrophic heterotrophs are organisms that utilize organic compounds as their primary source for various essential functions. Here's a breakdown of their requirements:

• Energy: They derive energy from the breakdown of organic molecules. This process involves catabolic reactions where energy is released and stored in the form of ATP.
• Hydrogen: Organic molecules serve as sources of hydrogen atoms, which are crucial for various biochemical reactions.
• Electrons: Electrons are obtained from organic compounds during oxidation reactions. These electrons are essential for cellular respiration and energy production.
• Carbon: Organic compounds provide the carbon necessary for building cellular structures and biomolecules.

Thus, the correct answer is: "Organic compounds as sources of energy, hydrogen, electrons and carbon."