In a Rhizobium-legume symbiosis, the microbial symbiont does which of the following processes for its host? a nitrogen fixation b absorption of water and inorganic nutrients c chemolithoautotrophy d produces light e digests cellulose How long have microbes been on Earth? a 3.5 million years b 3.5 billion years c 3.5 trillion years d About a decade or so e There is no way to know. Where is lipopolysaccharide found in a bacterial cell? a the plasma membrane b the outer membrane c the mitochondrial membrane d the thylakoid membrane e only viruses have LPS What is the purpose of bacterial sigma factors? a Transcription termination b Recognition of promoter sequence c Translation initiation d DNA replication e only archaea have sigma factors
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In a Rhizobium-legume symbiosis, the microbial symbiont does which of the following processes for its host? Rhizobium bacteria are known for their ability to fix nitrogen for their host plants. So, the answer is: $\boxed{\text{a nitrogen fixation}}$ Show more…
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The symbiosis between legumes and rhizobia involves a number of benefits for both the bacteria and plants. Which of the following are true about this relationship? There is more than one correct choice, please select all options that apply to receive credit. The bacteria provide phosphorus to the plants. The plant provides carbon and energy to the bacteria. Plants provide leghemoglobin, which provides the bacteria with oxygen at levels that allow aerobic respiration but do not inhibit nitrogenase. The rhizobia provide a source of fixed nitrogen to the plant. Ammonification by the bacteria provides a source of NH3 to the plants. Plants form root nodules that provide a protected environment in which the bacteria can grow. Syntrophic metabolism by the bacteria enhances plant metabolism.
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Rhizobium, a nitrogen-fixing bacterium, is present in symbiotic association with the roots of leguminous plants like peas. This bacterium converts atmospheric nitrogen into a usable form of nitrogen. However, in plants like roses, this bacterium is not present. So, where do they get nitrogen from? (A) Urea is added to the soil (B) They can obtain it from other plants (C) They absorb nitrogen gas from the air (D) Any of these.
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