Unit 2 Test Flashcards
linear sequence, peptide bonds, strong covalent
Primary Structure
backbone interactions, hydrogen bonds, weak hydrogen
Secondary Structure
distant interactions, hydrogen bonds, vander walls, hydrophobic packing, disulfide bridge formations, strong covalent, weak hydrogen
Tertiary Structure
multiple polypeptides, strong covalent, weak hydrogen
Quaternary Structure
What goes in the cell in the passive diffusion?
gases, small polar molecules, large non-polar
What does not go in the cell through passive diffusion?
large, polar molecules, and charged ions
Is cholesterol an amphipathic molecule?
Yes
What role does cholesterol play in the cell membrane?
reduces the movement of fatty acid tails and prevents solidifying/crystallizing
Why is a rigid membrane bad?
decreases permeability and potentially restricting entry of important molecules; slows cell growth; liquid in cell might freeze and kill cells
Why is a fluid membrane bad?
could allow some harmful molecules to enter the cell; proteins will be damaged
amphipathic, transmembrane protein
integral protein
protein not embedded in the lipid bilayer, loosely banned to membrane surface
peripheral protein
Where are carbohydrates found?
On the exterior of the cell membrane
carbohydrates bound to proteins; cell to cell communication; communication with immune system
Glycoproteins
carbohydrates bound to phospholipids; recognition, adhesion, cell signaling
Glycolipids
What are the functions of carbohydrates in the cell membrane?
provide structure and communication, helps obtain substances necessary for function, keeps water at cell membrane surface
Movement of a single molecule is
random
Movement of a population can
have direction
Bind to molecule and change shape to shuttle them across membrane
Carrier Proteins
Provide corridors that allow molecules or ions to cross cell membrane
Channel Proteins
