The plasma membrane is composed of-
monosaccharides-
nucleotides-
fatty acids-
or amino acids

yes, because even though a theory has a  lot of evidence to support it, it is not always true

ok yes, but what is the question? as soon as you ask the actual question i will answer it. : )

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.