4. Crossing over is a very important event
in Prophase 1 of meiosis! What happens
during crossing over and what is the
significance?

this protocol provides a detailed procedure for chromatin immunoprecipitation (chip) to study the dna-protein interactions.

i think its through the fallopian tube

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.