Cell membrane structure — key components?
Phospholipid bilayer, proteins, cholesterol, glycocalyx.
Membrane transport — energy use?
Passive: no; Active: yes.
Membrane potential — main ion?
Potassium (K+).
Phospholipid Bilayer — structure?
Two-layer membrane with hydrophilic heads, hydrophobic tails.
Fluid Mosaic Model — description?
Dynamic membrane with lipids, proteins, cholesterol, carbohydrates.
Integral Proteins — role?
Embed fully; facilitate transport and signaling.
Peripheral Proteins — function?
Attach temporarily; involved in signaling, shape.
Glycocalyx — composition?
Glycoproteins and glycolipids on cell surface.
Cholesterol — membrane role?
Modulates fluidity and stability.
Passive Transport — definition?
Substances move without energy, driven by gradients.
Answer 10 questions on Cell Membrane Function and Transport.
1. What is the structure of the cell membrane primarily composed of?
2. What ions does the sodium-potassium pump (Na+/K+ ATPase) move across the cell membrane, and in what quantities per ATP hydrolyzed?
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