High heat increases the kinetic energy of lipid tails, increasing the membrane's fluidity.
Plasmalemma is a biological synonym for the plasma membrane.
Cholesterol intercalates between the fatty acid tails, stabilizing the membrane.
Lipids can self-seal due to the hydrophobic effect, reforming the bilayer automatically.
Simple diffusion occurs directly through the lipid bilayer for small, non-polar molecules.
The phosphate group is ionized and hydrophilic, ensuring the "head" interacts with the aqueous environment.
Peripheral proteins are bound to the surface, not embedded, making them easier to isolate.
Hormones and other signaling molecules bind to glycoprotein receptors on the cell surface.
The "kinks" created by double bonds prevent tight packing, which lowers the melting point and increases fluidity.
Maintaining concentration gradients against the electrochemical gradient necessitates active transport.
Standard plasma membranes are approximately 7.5 nanometers (or 75 Angstroms) in width.
Cholesterol restricts the lateral movement of phospholipids, thus decreasing fluidity at high temperatures.
Transmembrane pumps (like the Na+/K+ pump) use ATP to change conformation and transport ions.
Amphipathic molecules are essential for forming the bilayer as they interact with both aqueous and non-aqueous environments.
Receptors are usually transmembrane integral proteins that span the membrane to receive signals.
Osmosis is defined as the net movement of water across a membrane driven by a water potential gradient.
Channel proteins provide a physical pathway, whereas carrier proteins undergo conformational changes to transport substances.
In hypertonic environments, the external water potential is lower than the cell, causing water to exit by osmosis.
The membrane is fluid and dynamic, not rigid or crystalline.
nmdcat.online
10980 MCQs
NMDCAT.ONLINE
1 MCQ
GULABsb
1 MCQ
