GCU BIO 181 EXAM SCRIPT COMPLETE
QUESTIONS AND CORRECT ANSWERS
LEARNING RESOURCE
●● Selective Permeability
Answer: Allows certain molecules to cross the membrane.
●● Phospholipids
Answer: Abundant lipids in the plasma membrane.
●● Amphipathic Molecules
Answer: Contain both hydrophobic and hydrophilic regions.
Phospholipids
●● Fluid Mosaic Model
Answer: Membrane is a fluid structure with a "mosaic" of various
proteins embedded in or attached to a bilayer of phospholipids.
●● Lateral Drift
Answer: Movement of lipids and proteins within the bilayer.
●● Transverse Flip-Flop
,Answer: Rare movement of lipids across the membrane.
●● Membrane Fluidity
Answer: Essential for proper membrane function.
●● Temperature Effect
Answer: Membranes transition from fluid to solid state.
●● Cholesterol
Answer: Regulates membrane fluidity at varying temperatures.
●● Fluid State
Answer: Membrane state similar to salad oil.
●● Solid State
Answer: Membrane state at lower temperatures.
●● Saturated Hydrocarbon Tails
Answer: Pack tightly, reducing membrane fluidity.
●● Unsaturated Hydrocarbon Tails
Answer: Prevent tight packing, enhancing fluidity.
,●● Peripheral Proteins
Answer: Proteins located on the membrane's surface.
●● Integral Proteins
Answer: Proteins embedded within the membrane.
●● Membrane
Answer: Collage of proteins in lipid bilayer.
●● Peripheral proteins
Answer: Bound to the membrane's surface.
●● Integral proteins
Answer: Penetrate the hydrophobic core of membranes.
●● Transmembrane proteins
Answer: Integral proteins spanning the entire membrane.
●● Hydrophobic regions
Answer: Nonpolar amino acids coiled into alpha helices.
, ●● Signal transduction
Answer: Process of transmitting signals through membranes.
●● Asymmetrical distribution
Answer: Different composition inside and outside membranes.
●● Selective permeability
Answer: Membrane's ability to regulate molecular traffic.
●● Hydrophobic molecules
Answer: Easily pass through lipid bilayer.
●● Hydrophilic molecules
Answer: Do not cross membranes easily.
●● Transport Proteins
Answer: Facilitate passage of hydrophilic substances.
●● Channel proteins
Answer: Provide hydrophilic tunnels for molecules.
●● Aquaporins
QUESTIONS AND CORRECT ANSWERS
LEARNING RESOURCE
●● Selective Permeability
Answer: Allows certain molecules to cross the membrane.
●● Phospholipids
Answer: Abundant lipids in the plasma membrane.
●● Amphipathic Molecules
Answer: Contain both hydrophobic and hydrophilic regions.
Phospholipids
●● Fluid Mosaic Model
Answer: Membrane is a fluid structure with a "mosaic" of various
proteins embedded in or attached to a bilayer of phospholipids.
●● Lateral Drift
Answer: Movement of lipids and proteins within the bilayer.
●● Transverse Flip-Flop
,Answer: Rare movement of lipids across the membrane.
●● Membrane Fluidity
Answer: Essential for proper membrane function.
●● Temperature Effect
Answer: Membranes transition from fluid to solid state.
●● Cholesterol
Answer: Regulates membrane fluidity at varying temperatures.
●● Fluid State
Answer: Membrane state similar to salad oil.
●● Solid State
Answer: Membrane state at lower temperatures.
●● Saturated Hydrocarbon Tails
Answer: Pack tightly, reducing membrane fluidity.
●● Unsaturated Hydrocarbon Tails
Answer: Prevent tight packing, enhancing fluidity.
,●● Peripheral Proteins
Answer: Proteins located on the membrane's surface.
●● Integral Proteins
Answer: Proteins embedded within the membrane.
●● Membrane
Answer: Collage of proteins in lipid bilayer.
●● Peripheral proteins
Answer: Bound to the membrane's surface.
●● Integral proteins
Answer: Penetrate the hydrophobic core of membranes.
●● Transmembrane proteins
Answer: Integral proteins spanning the entire membrane.
●● Hydrophobic regions
Answer: Nonpolar amino acids coiled into alpha helices.
, ●● Signal transduction
Answer: Process of transmitting signals through membranes.
●● Asymmetrical distribution
Answer: Different composition inside and outside membranes.
●● Selective permeability
Answer: Membrane's ability to regulate molecular traffic.
●● Hydrophobic molecules
Answer: Easily pass through lipid bilayer.
●● Hydrophilic molecules
Answer: Do not cross membranes easily.
●● Transport Proteins
Answer: Facilitate passage of hydrophilic substances.
●● Channel proteins
Answer: Provide hydrophilic tunnels for molecules.
●● Aquaporins
