Which of the following is NOT a structural characteristic of epithelial tissue? Cells have the ability to regenerate
Cells have an apical and a basal surface
Cells are attached to a basement membrane
Cells are held together by special proteins
Cells are highly vascular

tissue

explanation:

it is actually formed by geoup of cells which is tissue

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.

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.