Why are nitrogen-fixing bacteria ecologically important? Why are humans interested in nitrogen-fixing bacteria? (Economic applications?)

the change in kinetic parameters caused by a competitive inhibitor is ? a) a decrease in apparent KM b) an increase in apparent KM c) a decrease in apparent Vmax d) an increase in catalytic efficiency e) an increase in apparent Vmax

What are the health effects of the following pollutants? a)      Carbon monoxide b)      Airborne particles c)      Ultrafine particles d)      Bioaerosols

The major pathway of ammonium assimilation combines two reactions in organisms with rich nitrogen enviroments. Write balanced equation of these two reactions with eznyme names.

Nitrogen fixing organisms have unique problems in terms of energy production and the need for low O2 tension to protect nitrogenase. Describe in detail how Azotobacter and Rhizobium species solve these problems. Thank you

Can someone please help me with 3 multiple choice question, please choose the best that fits, Thank you  1) Most of the nitrogen on earth is contained in nitrogen gas in the atmosphere, which of the following orgnisms convert nitrogen to a form accessible to the rest of the biological community ? A)fungi B)nitrogen fixing prokaryotes C) plants D) nitrogen fixing protists   2)if a meteor impact or volcanic eruption injected a lot of dust into the atmosphere and significantly reduced the sunlight reaching Earth's surface for one year, which of the following marine communitites would be least affected? A)coral reef B)estuary C) intertidal D) deep -sea-vent E) wetlands   3)In terrestrial biomes, which factor is dependent on all the others? A)mineral nutrient availability B)annual average precipitation C) soil structure D)the  specific plant and animal species E) light availability

Discuss the possibility of life on Mars. Will extremophiles prove useful?  Can you explain the upper-temperature limit to life unrelated to the stability of proteins or nucleic acids? How influential is microbial activity on the geological processes of mineral formation and deposition compared to biological processes? Can you argue both sides? What are the challenges and advantages of the use of extremeophiles in industrial or bioremediation applications?

Most ecosystems on Earth rely on sunlight as the primary energy source for the synthesis of organic compounds that living organisms need. Sunlight does not penetrate deep enough in the ocean to provide energy for organisms living near hydrothermal vents. How can these densely populated communities survive without energy from the sun? A. chemoheterotrophic bacteria convert organic compounds into carbon dioxide which is used by other organisms as an energy source B. chemoautotrophic bacteria harvest chemical energy from hydrogen sulfide and then provide the basis of food for the vent communities C. chemoheterotrophic bacteria harvest chemical energy from hydrogen sulfide and then provide the basis of food for the vent communities D. chemoautotrophic bacteria fix nitrogen which then is used as a source of energy for other organisms

this was wrong please help

What would life be like for photoautotrophs if there were no chemoheterotrophs if there were no photoautotrophs?