You inoculate Lactobacillus casei into a nitrate broth. After incubation, you observe no gas trapped in the Durham tube. You add SA and DMN and observe a color change from clear to dark pink. Afterwards, you add a milligram of zinc dust, and the solution becomes a blood red color. What form of nitrogen is present in the tube

What feature of cell theory is best demonstrated in the image

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z

How are the reproductive cycles of a fungus and a pteridophyte similar? a)both organisms form fruiting bodies that produce diploid seeds. b)both organisms produce haploid spores and exhibit diploid and haploid stages. c)both organisms reproduce sexually when two haploid hyphae fuse. d)both organisms exhibit a diploid stage and are only able to reproduce asexually.