Name:
Period:
Cell Membrane Review
1. The cell membrane needs to be f
Flexible, allow for movement.
. Why?
2. A. What does homeostasis mean? B. How does the cell membrane help with homeostasis?
C. What would happen to the cell if there was no cell membrane? (Do not say, “it would die”).
A) Balanced internal condition of cells.
B) Regulates materials inside and outside the cell.
C) Things would be able to move freely in and out the cell, including organelles, toxins, etc.
3. What are the two main function of the cell membrane?
1) Protective Barrier
2) Regulate what enters and leaves the cell
4. What does “selectively permeable” membrane mean? What is another name for this
membrane?
-Some things can enter while others cannot
-Semipermeable
5. The cell membrane is made up of many components. What part do phospholipids make up?
-Cell membrane
6. Phospholipids are made up of two main components. Use each of the following words once to
describe each part : hydrophobic, hydrophilic, nonpolar, polar
Tail:
nonpolar
Head: polar
,
,
hydrophobic
hydrophilc
.
.
7A. What does arachnophobia mean? Fear of spiders
7B. What does arachnephilia mean? Love of spiders
7C. What does –philic mean? Love / appreciation of
7D. What does –phobic mean? Fear of
7E. What does hydro- mean? Water
8. Name a substance from the kitchen that is hydrophilic. From the kitchen that is hydrophobic.
H.philic – salt, sugar
H.phobic – fat, oils
9A. What does the prefix “bi-“ mean? What does “bilayer” mean?
-Bi – 2
-2 layers
9B. Name something else with the prefix “bi-“ and what does your word mean?
Bicycle – 2 wheels
10. Name two things that can pass through the membrane easily.
Small things, hydrophobic things.
11. Does this make sense? Why?
-Yes. Small things move easily, and most of the lipid bilayer is hydrophobic
12. Name two things that cannot pass through the membrane on their own.
Large things, hydrophilic things
13. Does this make sense? Why?
Yes. Large things will struggle to make it through the membrane, and hydrophilic things will want
to stay in water and not cross the large hydrophobic area.
14. Name two other macromolecules that are found in the lipid bilayer.
Carbohydrates and proteins
15. How are microfilaments and microtubules similar? How are their functions different?
MF and MT both maintain cell structure (for the cytoskeleton)
MT move things within the cell, MF move the actual cell.
16. How are chloroplast and chlorophyll related?
Chlorophyll are located inside chloroplast
17. Draw the cell membrane. Include and label: lipid bilayer, (2) hydrophilic heads,
hydrophobic tails, cytoplasm (inside the cell), outside the cell, protein channel.