Question 7 A filamentous Cyanobacteria would form heterocysts: In response to a surplus of glucose O In response to a surplus of nitrogen O In response to a lack of glucose O In response to a lack of nitrogen 1 pts
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Heterocysts are specialized cells that fix atmospheric nitrogen into a form that can be used by the organism. Show more…
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Cyanobacteria are a large group of prokaryotic organisms. Cyanobacteria are found in marine microbial mats that include many species of eukaryotic and prokaryotic organisms that can participate in mutualistic symbiotic relationships. One recently discovered species of cyanobacteria, UCYN-A, lacks the genes that encode ribulose bisphosphate carboxylase/oxygenase (RuBisCo), components of photosystem II, and the Krebs cycle. UCYN-A contains genes enabling nitrogen fixation, which allows the enzymatic conversion of atmospheric nitrogen to biologically available nitrogen compounds such as nitrate. Within the microbial community there is relatively little available nitrogen. The majority of organisms in the microbial mat cannot fix nitrogen. Identify the metabolic process whereby UCYN-A is most likely to produce ATIP.
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Cyanobacteria are halotolerant: They are capable of accumulating low molecular weight halides intracellularly in response to a high osmotic pressure. They can be cultivated in a medium containing 0.11M NaCl, or in a medium containing 0.49 M NaCl and 0.01 M CaCl2. When cells grown in more saline medium are transferred to the fresh water, their cell-wall cracks and they become permeable, i.e., the intracellular carbohydrate and amino acid are released into the medium within 2 min. Estimate the osmotic pressure difference which makes the membranes of the cyanobacteria permeable.
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