QUIZ 1. From what source do carbon-fixing bacteria get their organic carbon from? a. Carbohydrates b. Protein c. Carbon dioxide d. Hydrocarbons Answer: c. Carbon-fixing bacteria can make use of the carbon found in carbon dioxide in order to make organic carbon-containing molecules. 2. What does the rhizobium species of bacteria make out of the nitrogen in the air? a. Proteins b. Ammonia c. Amino acids d. Small peptides Answer: b. Rhizobium can fix the nitrogen from the air so that they can make ammonia that is further turned into higher-order nitrogenous compounds by plant species the bacteria live near. 3. The phylum of protobacteria are actually subtypes of what kind of bacterium? a. Gram positive bacteria b. Gram negative bacteria c. Deeply branching bacteria d. Atypical bacteria Answer: b. Protobacteria are a phylum that represents some types of gram-negative bacteria.
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