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BS161 Exam 2 Exam Prep Questions And Answers ()
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BS161 Exam 2 Exam Prep Questions And Answers (202472025)Composed of lipids, proteins, and carbs
-phospholipids are amphipathic molecs.
(polar head group, nonpolar fatty acid tail)
-phospholipid bilayer (2 layers of phospholipids w/ tails pointing inward) - ✔✔What is the
structure of a membrane?
Unsaturated - ✔✔Is this un/saturated?
Saturated - ✔✔Is this un/saturated?
Cholesterol - ✔✔Other than double bonds, what increases the fluidity of a membrane?
Proteins that penetrate the membrane
-contain a hydrophobic domain that resides in the hydrophobic core of the membrane. - ✔✔What
are integral membrane proteins?
Proteins associated with the membrane but do not penetrate it - ✔✔What are peripheral
membrane proteins?
Laterally and rotate - ✔✔How can membrane proteins move within a lipid bilayer
*Transport*
enzymatic activity
signal transduction
cell to cell recognition
intercellular joining
attachment to cytoskeleton and extracellular matrix - ✔✔What are some fxs of Membrane
proteins?
, hydrophobic molecules - ✔✔Biological membranes are semipermeable. What is allowed to pass
through without any assistance?
polar molecules and ions - ✔✔Biological membranes are semipermeable. What passes with the
help of Transport Proteins?
1) Passive transport (no protein necessary)
2) Channel
3)Carrier
4)Carrier - ✔✔Name the types of transport membrane proteins
molecs. can pass thru membrane w/out the help of a protein and doesn't use energy - ✔✔What is
Passive Diffusion?
Proteins assist transporting polar/ions to opposite side of membrane - ✔✔What is Facilitated
Diffusion?
the movement of water across membrane - ✔✔What is Osmosis?
The ability of a solution to cause the cell to lose or gain H2O - ✔✔What is Tonicity?
[solute] is same on both sides of membrane - ✔✔Define Isotonic
[solute] greater on inside of membrane
*water moves toward hypertonic* - ✔✔Define hypertonic
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