Membrane Test Preparation
Define the key characteristics of the following transport terms:
1. Active Transport
 _______________________________________________________________
 _______________________________________________________________
2. Diffusion
 _______________________________________________________________
 _______________________________________________________________
3. Facilitated Diffusion
 _______________________________________________________________
 _______________________________________________________________
 _______________________________________________________________
4. Osmosis
 _______________________________________________________________
 _______________________________________________________________
Classifying each of the following examples as Active Transport (AT), Diffusion (D), Facilitated Diffusion (FD),
and Osmosis (O). Place the letter designation in the blank to the right of each example.
 Water absorbed by plant roots
 A drop of food coloring in a beaker of
water
 The smell of a skunk
 The movement of highly
concentrated H+ ions from one side
of the membrane to the other side of
a membrane through a protein
channel
 Movement of oxygen from the blood
stream into the oxygen starved
muscle cells.
 Water rushing out of a cell placed
into a hypertonic solution
 Glucose molecules moving out of a
dialysis tubing bag into the beaker of
IKI
 The endocytosis of food particles
outside the cell with the expenditure
(spending) of ATP
 Swollen ankle soaked in a salt bath
 Large molecules moving across a
membrane through a transport
protein from high concentration to
low concentration
 Sodium ions moving across a
membrane against diffusion
Define the key characteristics of the following vocabulary terms:
1. Homeostasis
 _______________________________________________________________
2. Equilibrium
 _______________________________________________________________
Classifying each of the following scenarios as an example of Homeostasis (HO) or Equilibrium (EQ). Place the
letter designation in the blank to the right of each example.
 Body temperature stays at 98.6
 Body regulates glucose levels in the
bloodstream
 Water moves across both sides of a
membrane in equal proportions
 Guard cells open and close to
regulate loss of water by the
stomates by transpiration
 New car smell all throughout the car
interior

 Water rushing out of a cell placed
into a hypertonic solution
 Glucose molecules moving out of a
dialysis tubing bag into the beaker of
IKI
In each of the beakers draw a cell. Place dots in the cell and the solution to illustrate the concentration of
each. Draw arrows to indicate which direction the net flow of water would be.
HYPOTONIC
ISOTONIC
HYPERTONIC
Circle the celery stalk that is experiencing the greatest turgor pressure. Label the solution (hypertonic or
hypotonic) in each beaker.
_______________
______________