In a plasma membrane, how do the tails of the phospholipid molecules line up?

they are sandwiched between two layers of heads.

they tangle randomly to form a fiber.

they alternate with the heads.

they stick out with the heads in the center.

What effect does plate tectonics have an organic evolution

How does a gymnosperm prevent itself from pollinating the same tree

Anurse is caring for a 42-year-old client who is scheduled for an amniocentesis during the fifteenth week of gestation because of concerns regarding down syndrome. what other fetal problem does an examination of the amniotic fluid reveal at this time?