Question:
I. A bacterium requires only the amino acid methionine as an organic nutrient and lives in lightless caves. What mode of nutrition does it employ? Explain.
Answer:
a)Chemoheterotrophic mode of nutrition - a nutritional classification where the microbe gets its energy from chemicals and its electrons and carbon from organic compounds.
b) Chemoheterotrophy; the bacterium must rely on chemical sources of energy, since it is not exposed to light, and it must be a heterotroph if it requires and organic source of carbon rather than CO2.
Question:
II. What are the sources of carbon and nitrogen for the cyanobacterium Anabaena?
Answers:
a) Anabaena is a photoautotroph that obtains its carbon from CO2. As a nitrogen-fixing prokaryote, Anabaena obtains its nitrogen from N2.
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