Chapter 28.

Cyanobacteria are?

• Primary producers.

• Consumers.

• Herbivores.

• Decomposers.

• More than one of the above.

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Which of the following is false?

• Culture techniques are an accurate way of determining which members in a microbial community are most common.

• Fluorescence in situ hybridization (FISH) can be sued to distinguish subsets of prokaryotes that contain a specific nucleotide sequence.

• Taxonomic diversity of prokaryotes can be studied by examining 16S rRNA sequences.

• Studying the genome of one organims can give insights into the characteristics of another.

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Which of the following Paris that relate to aquatic environments does not match?

• Oligotrophic---O2 poor.

• Hypoxic----O2 poor.

• Epilimnion---O2 poor.

• Hypolimnion---Lower layer.

• Eutrophic---Nutrient rich.

Adding high levels of nutrients to a lake or inshore area would have all of the following in that environment except?

• Death of calms and crabs.

• Increased growth of heterotrophic microbes.

• Increased growth of photosynthetic organism.

• Increased levels of dissolved O2-.

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Which of the following is not a matching pair?

• Soil--minimal biodiversity.

• Bacillus---endospores.

• Streptomyces--geosmin production.

• Fungi--lignin degradation.

• Rhizosphere--soil that adheres to plant root.

Atmospheric nitrogen can be used?

• Directly by all living organisms.

• Only by aerobic bacteria.

• Only by anaerobic bacteria.

• In symbiotic relationships between rhizobia and plants.

• In photosynthesis.

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Which process converts ammonium (NH4+) into nitrate (No3-)?

• Nitrogen fixation.

• Ammonification.

• Nitrification.

• Denitrificatoin.

• Anammox.

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NGSS.MS-LS2-3

Energy for ecosystems can come from?

• Sunlight via photosynthesis.

• Oxidation of reduced inorganic chemicals by chemoautotrophs.

• Sunlight via photosynthesis & Oxidation of reduced inorganic chemicals by chemoautotrophs.

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Mycorrhizas represent associations between plant roots and microorganism that?

• Are antagonistic.

• Help plants take up phosphorus and other nutrients from soil.

• Involve algae in the association with plant roots.

• Form nodules on the plant's leaves.

• Lead to the production of antibiotics.

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In symbiotic nitrogen fixation by rhizobia and legumes?

• The amount of nitrogen is much greater than by non symbiotic organism.

• Neither the bacteria nor the legume can exist independently.

• The bacteria enter the leaves of the legume.

• The bacteria operate independently of the legume.

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