Asection of a chromosome that determines the structure of a single protein or part one, thereby influencing a particular hereditary characteristic such as eye color or particularl biochemical reaction is called ?

If I'm not mistaken I think the answer you're looking for is a gene. I'm not entirely sure but if I'm right I hope it helps.

while the heads of the phospholipid structure attract water, the tails are hydrophobic. the model shows how the hydrophilic section folds around the fluid molecules to bring them into the cell so they don’t need to pass through the hydrophobic tails.