Ch 11
What does the Fluid Mosaic Model consist of?
What are Lipids and Proteins?
Are differences in bilayer generated sooner or later in the bilayer synthesis process?
What is differences in bilayer are generated as soon as the bilayer is synthesized deep in the cell, in the endoplasmic reticulum?
What is the name of the most common phospholipid in cell membrane?
What is Phosphatidylcholine?
Proteins make up what percentage of the lipid bilayer?
What is 50%?
Describe the affect the number of double bonds has on the lipid bilayer fluidity.
What is the more unsaturated tail (more double bonds), the more fluid because more difficult to pack together?
What is the difference between the cell membranes of bacterial cells and eukaryotic cells?
What are eukaryotic cells have an outer membrane and many inner membranes that allow them to make organelles and separate reactions?
What are examples of proteins in the lipid bilayer?
What are Ion channels, Enzymes, Receptors, and Transporters?
True or False: fat molecules are amphipathic
What is False; fat molecules are hydrophobic unlike phospholipids that are amphipathic.
Is the lipid bilayer symmetrical?
What is no, it is asymmetrical.
How does the length of the hydrophobic tail affect lipid bilayer fluidity?
What is the shorter the tail, the less number of interactions of tails, thus increased fluidity?
True or False: Proteins can be transported only into a cell
What is False?
What does the enzyme Flippase do?
What is Flip Flop is not spontaneous and requires energy from Flippase?
What happens if you put a planar phospholipid bilayer in water?
What is it will spontaneously close so that the hydrophilic part faces water?
What is because one side faces the cytosol and other side faces the extracellular space?
What are the two factors that lipid bilayer fluidity depends on?
What is length of hydrophobic tail and number of double bonds the hydrophobic tail contains?
Describe the lipid bilayer
What is heads are hydrophilic and tails are hydrophobic. The lipid bilayer is amphipathic?
Where are the following lipids found- inside or outside bilayer:Phosphatidylcholine, Sphingomyelin, and Cholesterol?
What is Phosphatidylcholine is found on the outside, Sphingomyelin is found on the outside, and Cholesterol is found on both sides?
What is closed?
Is cholesterol hydrophobic or hydrophilic or amphipathic?
What is amphipathic? --> Polar head, non polar tail, and rigid planar steroid ring structure in the center.
Of the three types of ways phospholipids can move within the plan of the membrane, which will not happen spontaneously?
What is flip-flop?
Why are the heads hydrophilic?
What is most reactions in our body are in water. The heads face the aqueous environment in our body?
What enzyme catalyzes the transfer of phospholipid molecules to opposite monolayer?
What is Flippase?
What are the three types of of ways that phospholipids can move within the plane of the membrane?
What is flexion, rotation, and flip-flop?
Describe the effect cholesterol has on the membrane
What is cholesterol stiffens the membrane because short and rigid so fills space between kinks of the double bond?
What are lipid rafts?
What are groups of lipids and proteins moving through the membrane together?