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CELL MEMBRANE SUMMARY QUESTIONS
*Scan and attach your membrane drawing with these answers and submit through Canvas.
What are the functions of the cell membrane?
. To protect the integrity of the interior of the cell by allowing certain
Substances into the cell while keeping other
. To control the movement of particles .
substances out .
membrane? . Com
The cell membrane is often described as a bilayer. Explain this term. What two layers make up the cell
onsists of a lipid bilayer. - Phosphate head : lipid tail.
.Includes cholesterols that sit between phospholipids to maintain their
fluidity under various temperatures.
. Indudes combination with proteins such as integral proteins and peripheral
Where are proteins found in the cell membrane? Proteins.
Peripheral proteins are embedded on one side of the cell membrane, either
on the outer surface of the interior wall .
. Integral membrane proteins are embedded within the cell membrane and
project into the cell or the external environment .
Explain why the cell membrane is described as a Fluid Mosaic Model.
. The fluid mosaic model states that membranes are composed of
phospholipid bilayer with various protein molecules floating around within it
. The "Fluid" part represents how some of the parts of the membrane can move freely,
if . they are not attached to other parts of the cell. " Mosaic" : collage of proteins.
Explain the function of a transport protein.
free moving -
. They make everything from nerve impulses to cellular metabolism
possible because they move substances across membranes. Each transport
protein is designed to transport a specific substance as needed
What is the function of cholesterol in the cell membrane ?
" cholesterol functions in intracellwar transport, cell signaling and nerve conduction.
. Helps give membrane extra
.Helps immobilize some of the lipid molecules, around them.
ofhelps keep the cell membrane fluid
Give an example of a molecule that is unable to pass through the cell membrane. Explain why.
Ionic Molecules can't pass through because of the hydrophobic- hydrophylic
interactions or because of the interaction between the charged heads of the phospholipid,
Explain the commonalities and differences between active transport and facilitated diffusion and give
an example of each. . Active transport - the movement of ions and molecules across a
cell membrane, from a region with a lower concentration to a region with a
higher concentration. It is executed against an obstructing factor and Requires energy.
. Facilitated Diffusion- A Spontaneous process of passive transportation of ions or molecules
across a blological membrane. It is carried out along concentration or electrochemical gradient
What is one possible message that one cell might send to another cell? and does not require energy.
Follicle- Stimulating hormone, which travels from the
mammalian brain to the ovary, where it triggers
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- Spring '16
- Doug Carmicheal