Shared Flashcard Set

Details

Bio 101 Lecture 8: Membranes and Transport
The laster....
13
Biology
Undergraduate 2
10/07/2012

Additional Biology Flashcards

 


 

Cards

Term
Biological Membranes
Definition
Phospholipid bilayers with proteins
Term
Membrane Fluidy
Definition
Lateral movement (lateral diffusion)
Term
Integral Proteins
Definition
-a protein molecule (or assembly of proteins) that is permanently attached to the biological membrane
-A helixes, slight squiggly
Term
Peripheral Proteins
Definition
-Proteins that adhere only temporarily to the biological membrane with which they are associated
-Really long and squiggly
Term
Substances Which Diffuse Across Lipid Bilayer
Definition
Hydrophobic Molecules = yes. Includes gases like 02, C02, n2.
Small polar particles like water, yes.
Large, a little.
Ions, glucose, sucrose, no.
Term
Active Transport
Definition
The movement of molecules across a membrane requiring ENERGY to be expanded by the cell.
Term
Passive Transport
Definition
Channels, direct diffusion across membrane.
-No external source of energy is required.
-
Term
Hypertonic Solution
Definition
Water exits cell; cell shrivels and becomes plasmolyzed
Term
Hypotonic Solution
Definition
Water enters cell, cell blooms and becomes turgid (normal)
Term
Sodium-Potassium Pump
Definition
3 Na+ pushed out for every 2 K- sucked in
Term
Endocytosis
Definition
When membrane sucks in particles into vacuoles
Term
Exocytosis
Definition
When vesicle approached plasma membrane and releases contents out
Term
Facilliated Diffusion
Definition
Helped by proteins
Supporting users have an ad free experience!