Nodules on roots of leguminous plants have __________ bacteria?
Correct answer: B. Nitrogen fixing
- A. Anaerobic
- B. Nitrogen fixing
- C. Nitrifying
- D. Ammonifying
Explanation
Root nodules of leguminous plants contain Rhizobium, which converts atmospheric nitrogen into usable nitrogen compounds through nitrogen fixation. Nitrifying bacteria convert ammonia or nitrites into other nitrogen compounds but do not form the characteristic symbiosis in these nodules. Students may choose nitrifying bacteria because both processes belong to the nitrogen cycle.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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