Textbook Question
Which of the following describes a bacterium that lives in the human intestine and causes disease?
a. Commensalist
b. Decomposer
c. Gut mutualist
d. Symbiotic pathogen
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26. Prokaryotes
Prokaryotic Metabolism
Multiple Choice
Organisms that use CO2 as their source of carbon are called
A
Organotrophs.
B
Heterotrophs.
C
Autotrophs.
D
Chemotrophs.
Verified step by step guidance1
Begin by understanding the definition of autotrophs. Autotrophs are organisms that can produce their own food using inorganic substances. They typically use carbon dioxide (CO2) as their carbon source.
Next, differentiate autotrophs from heterotrophs. Heterotrophs obtain their carbon from organic compounds, not CO2, and rely on other organisms for their food.
Consider the term 'organotrophs.' Organotrophs obtain electrons from organic compounds, which is different from autotrophs that use inorganic sources like CO2.
Examine the term 'chemotrophs.' Chemotrophs obtain energy from chemical reactions, but this term does not specify the source of carbon, unlike autotrophs which specifically use CO2.
Conclude by recognizing that autotrophs are the correct classification for organisms that use CO2 as their carbon source, distinguishing them from the other terms provided.
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