BSC1010 EXAM 2 QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
2024/2025
What is the Plasma Membrane made of?
amphipathic phospholipids, other lipids, and proteins
How does cholesterol help the PM
cholesterol can help keep the membrane maintain the right fluidity
peripheral protein
bound to the surface of the membrane
integral protein
penetrate the hydrophobic core
transmembrane proteins and seven-spanning and what type of protein
integral protein
six major functions of membrane proteins
transport
enzymatic activity
signal transduction
, cell-cell recognition
inter-cellular joining
attachment
Hydrophobic (nonpolar) molecules
dissolve in lipid bilayer and pass through membrane easily
ex: hydrocarbons, 02 and CO2
Hydrophilic molecules
do not cross the membrane easily
ex: ions and polar molecules
aquaporins
transport protein that is also a channel protein; facilitates passage of water
passive transport
diffusion of a subs across aa biological membrane; no energy needed
ex: osmosis
active transport
moves substances against their conc. gradient; requires energy in the form of ATP
ex: sodium-potassium pump
osmosis
diffusion of H2O across selectively perm. membrane
concentration gradient
COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
2024/2025
What is the Plasma Membrane made of?
amphipathic phospholipids, other lipids, and proteins
How does cholesterol help the PM
cholesterol can help keep the membrane maintain the right fluidity
peripheral protein
bound to the surface of the membrane
integral protein
penetrate the hydrophobic core
transmembrane proteins and seven-spanning and what type of protein
integral protein
six major functions of membrane proteins
transport
enzymatic activity
signal transduction
, cell-cell recognition
inter-cellular joining
attachment
Hydrophobic (nonpolar) molecules
dissolve in lipid bilayer and pass through membrane easily
ex: hydrocarbons, 02 and CO2
Hydrophilic molecules
do not cross the membrane easily
ex: ions and polar molecules
aquaporins
transport protein that is also a channel protein; facilitates passage of water
passive transport
diffusion of a subs across aa biological membrane; no energy needed
ex: osmosis
active transport
moves substances against their conc. gradient; requires energy in the form of ATP
ex: sodium-potassium pump
osmosis
diffusion of H2O across selectively perm. membrane
concentration gradient
