Nitrogen is in the air in the form N,, which cannot be incorporated into nitrogen-containing molecules. However, some organisms can fix atmospheric nitrogen, making the nitrogen available for use in the biosynthesis of nitrogen-containing molecules. Identify the correct statements about nitrogen fixation. a. Atmospheric nitrogen is reduced to the biologically useful form NH, (or NH). b. Nitrogen fixation is energetically neutral, using a negligible amount of ATP. c. The enzyme nitrogenase, which takes part in nitrogen fixation, is inactivated by oxygen. d. Nitrogen fixation in nature and in the lab requires a metal cofactor or catalyst. e. The availability of fixed nitrogen limits biological productivity. f. Ammonium from the atmosphere is fixed to more usable forms of nitrogen, such as nitrate (NO, ).
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Biology, 21.06.2019 16:10, jroig42
Which of the following statements regarding anfinsen's denaturing experiments with ribonuclease a (rnase a) are valid? exposing the denatured protein to air oxidation and then dialysis to remove urea restored the protein to its original functionality. removing urea by dialysis and then allowing air oxidation of the denatured protein restored the protein to its original functionality. denaturing the protein with both urea and β-mercaptoethanol yielded an inactive protein. anfinsen concluded that protein folding is determined by its primary sequence.
Answers: 3
Biology, 22.06.2019 06:30, DwayneLeonard618
Study the picture of the ocean. which is the best example of an organism’s niche shown in the picture? a. the environment contains several of the same species of coral. b. the shallow area of the ocean meets the needs of the coral and the fish. c. the ocean has fish and coral that live in the same area. d. the coral take in food from the water and provide shelter for the fish.
Answers: 2
Nitrogen is in the air in the form N,, which cannot be incorporated into nitrogen-containing molecul...
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