Bio414- Exam I

camaldo2's version from 2017-05-24 10:54

Section 1

Question Answer
What are the six primary function of the surface membrane?1. Boundary/permeability, organization of function, transport, signaling, cell to cell interaction, MAINTAIN GRADIENT
What is an example of molecules with the highest membrane permeability?small and non polar molecules like O2, CO2, N2
What type of molecule has the least membrane permeability?Ions such as Cl-, K+, and Na+
What components is a phospholipid made of?polar or charged group, phosphate, glycerol, and 2 fatty acid chain
Membranes has different compositions profiles of phospholipids. What does this based/depend on?Based on the different cell type
What are the four factors that effect membrane permeability?1. The double bonds in phospholipid hydrophobic tail 2. Length of tail 3. cholesterol molecules 4. temperature
Name the three characteristics that gives a membrane high permeability/ high fluidity1. Short tail 2. Unsaturated tail 3. More double bonds
Name the three characteristics that gives a membrane low permeability/ low fluidity1. Long tail 2. Saturated tail 3. Less double bond
In what direction do phosphilipids move?Laterally
How quickly molecules move within and across membrane is a function of what 3 factors?1. temperature 2. structure of hydrocarbon tail 3. no. of cholesterol in the bilayer

Section 2

Question Answer
Is the membrane homogenous or heterogenous? Why?Heterogenous because of the different amounts of phospholipids, protein, steroids and lipid rafts
What are the three functions of the lipid raft?1. Signaling 2. Transport 3. Cell identification
What component captures and organizes particular lipid rafts?raft- associates proteins
A cell is able to maintain gradients. What are two different types of gradients?transmembrane and ion electrochemistry gradient


what is the difference between support and anti port?: coupled transport is known as support if the two solutes are moved in the same direction
antiport is when two solutes move in the opposite direction
*main different in carrier proteins is the no. of solutes transported and what direction they move