Function of the cell membrane
Flashcards- Ch 7 Cell Membrane Structure

Flashcard
•
Science
•
9th Grade
•
Easy
Kelly Jones
Used 1+ times
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52 questions
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1.
FLASHCARD QUESTION
Front
Back
The cell membrane is often referred to as "the edge of life" because it defines the boundary of the cell and regulates the movement of substances in and out.
2.
FLASHCARD QUESTION
Front
Membrane functions
Back
- Allow some substances to leave or enter the cell - Maintain internal and external cell environments - Display cell antigens/markers - Hold receptors for large molecules - Seal, fuse, and remain flexible as the cell changes shape
3.
FLASHCARD QUESTION
Front
describe the structure of phospholipids.
Back
Phospholipids have a glycerol backbone attached to a phosphate group and 2 fatty acid chains. Phospholipids are amphipathic, meaning they have both hydrophobic and hydrophilic ends.
4.
FLASHCARD QUESTION
Front
Identify hydrophobic and hydrophilic regions of a phospholipid.
Back
The glycerol and phosphate group are hydrophilic (polar); the lipid tails are hydrophobic (nonpolar)
5.
FLASHCARD QUESTION
Front
Result of phospholipid structure in water
Back
Cell membrane forms spontaneously as a lipid bilayer.
6.
FLASHCARD QUESTION
Front
Function of protein channels in lipid bilayer
Back
Protein channels penetrate the lipid bilayer to prevent complete impermeability. Allow specific molecules that are too large or too polar to cross the membrane.
7.
FLASHCARD QUESTION
Front
Role of hydrophobic amino acids in proteins
Back
Hydrophobic amino acids allow proteins to embed themselves in the phospholipid tail region of the plasma membrane since the membrane is hydrophobic there.
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