Vitamin b12 is attached to a protein called transcobalamin ii and travels in the blood bound to this protein. vitamin b12 is attached to a protein called transcobalamin ii and travels in the blood bound to this protein. a. true b. false

The answer is true. Vitamin B12is progressively immersed transversely the membranes of intestinal cells, where it is connected to a particular protein called transcobalamin II. This complex go through the portal vein and to the liver, where thereafter go in the bloodstream.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.