For local communication, signaling molecules CANNOT a) remain bound to the plasma membrane of the cell that produces it

[answerhappygod]

For local communication, signaling molecules
CANNOT
a)
remain bound to the plasma membrane of the cell that produces it
and directly act on the receptor on the adjacent target cell.
b)
communicate with its target cell via direct cytoplasmic
transfer.
c)
diffuse through the ECF and enter the bloodstream to reach its
target cells.
d)
act on the cell that releases it.
A secondary active transporter
a)
must hydrolyze ATP to move molecules across the plasma
membrane
b)
can function without primary active transporters.
c)
must be cotransporters.
d)
creates a passageway that connects the ECF and ICF
compartments.
e)
moves all molecules against their concentration gradients.
As compared to red blood cells (with internal osmolarity of ~300
mOsM), which of the following is hyperosmotic?
a)
300 mOsM NaCl
b)
100 mOsM NaCl
c)
200 mOsM NaCl plus 50 mM glucose
d)
200 mM NaCl
e)
150 mM glucose plus 150 OsM urea