Textbook Question
___________ are small organic molecules that are required in minute amounts for metabolism.
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10. Dynamics of Microbial Growth
Nutritional Factors of Microbial Growth
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
In the context of nutritional factors of microbial growth, how do heterotrophic bacteria primarily obtain energy?
A
By fixing as the primary carbon and energy source (autotrophy)
B
By using light as the primary energy source (phototrophy)
C
By oxidizing organic compounds (chemical energy from preformed carbon-containing molecules)
D
By oxidizing inorganic chemicals such as or (chemolithotrophy)
Verified step by step guidance1
Understand the definition of heterotrophic bacteria: these bacteria obtain their carbon and energy from organic compounds rather than fixing carbon dioxide (CO\_2) themselves.
Recognize that autotrophy involves fixing CO\_2 as the primary carbon and energy source, which is characteristic of autotrophic organisms, not heterotrophs.
Recall that phototrophy refers to organisms that use light as their primary energy source, which is typical of photosynthetic bacteria, not heterotrophic bacteria.
Identify chemolithotrophy as the process where bacteria oxidize inorganic chemicals such as H\_2S or Fe\^{2+} to obtain energy, which is distinct from heterotrophic metabolism.
Conclude that heterotrophic bacteria primarily obtain energy by oxidizing organic compounds, meaning they use chemical energy from preformed carbon-containing molecules, which aligns with their nutritional requirements.
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