20 Questions
What is the main function of membrane proteins?
Anchoring and locomotion
Which molecule makes the lipid bilayer stronger but less fluid at normal body temperature?
Cholesterol
What is the main purpose of membrane carbohydrates?
Receptors for ligands
What type of molecules is the lipid bilayer impermeable to?
Ions
What contributes to the creation of membrane potential?
Electrical gradient across the plasma membrane
What is the structure that surrounds and contains the cytoplasm of a cell?
Plasma membrane
According to the fluid mosaic model, what does the molecular arrangement of the plasma membrane resemble?
A continually moving sea of fluid lipids with a mosaic of different proteins
Which statement best describes the role of some proteins in the plasma membrane according to the fluid mosaic model?
They float freely in the lipid sea, like icebergs
In which body compartment do changes in volume occur with iso-, hypo-, and hyper-osmotic fluid?
Extracellular compartment
What is the main component of the plasma membrane according to its structure?
Phospholipid Bilayer
Which process involves the movement of molecules from an area of low concentration to an area of high concentration using energy from ATP?
Primary active transport
What is the name for the different types of ion channels present in the plasma membrane?
Gated channels
What is the process by which molecules or ions move across a cell membrane from an area of higher concentration to an area of lower concentration without the input of energy?
Facilitated diffusion
Which model describes the molecular arrangement of the plasma membrane resembling a continually moving sea of fluid lipids with a mosaic of many different proteins?
Fluid mosaic model
What is the term for the process by which cells ingest external fluid, macromolecules, and large particles, including other cells?
Endocytosis
What is the main function of glycolipids in the plasma membrane?
Recognition for the body’s immune system
Which type of molecules is the lipid bilayer impermeable to?
Ions and large, uncharged polar molecules
What contributes to the creation of membrane potential?
The electrical gradient across the plasma membrane
Which statement best describes the role of cholesterol in the plasma membrane?
Makes the lipid bilayer stronger but less fluid at normal body temperature
What are the main components of the glycocalyx in the plasma membrane?
Proteoglycans, glycoproteins, and glycolipids
Test your knowledge on the structure of the plasma membrane, selective permeability, electrochemical gradient, ion channels, and passive and active transport processes across plasma membranes. Explore the differences between simple and facilitated diffusion, primary and secondary active transport.
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