Cell Physiology: Plasma Membrane Structure and Transport
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Questions and Answers

What is the main function of membrane proteins?

  • Lubrication and protection
  • Strengthening the lipid bilayer
  • Increasing membrane fluidity
  • Anchoring and locomotion (correct)

    • Which molecule makes the lipid bilayer stronger but less fluid at normal body temperature?

  • Phospholipids
  • Glycolipids
  • Proteoglycans
  • Cholesterol (correct)

    • What is the main purpose of membrane carbohydrates?

  • Receptors for ligands (correct)
  • Transporting solutes
  • Strengthening the lipid bilayer
  • Increasing membrane permeability

    • What type of molecules is the lipid bilayer impermeable to?

    <p>Ions</p> Signup and view all the answers

    What contributes to the creation of membrane potential?

    <p>Electrical gradient across the plasma membrane</p> Signup and view all the answers

    What is the structure that surrounds and contains the cytoplasm of a cell?

    <p>Plasma membrane</p> Signup and view all the answers

    According to the fluid mosaic model, what does the molecular arrangement of the plasma membrane resemble?

    <p>A continually moving sea of fluid lipids with a mosaic of different proteins</p> Signup and view all the answers

    Which statement best describes the role of some proteins in the plasma membrane according to the fluid mosaic model?

    <p>They float freely in the lipid sea, like icebergs</p> Signup and view all the answers

    In which body compartment do changes in volume occur with iso-, hypo-, and hyper-osmotic fluid?

    <p>Extracellular compartment</p> Signup and view all the answers

    What is the main component of the plasma membrane according to its structure?

    <p>Phospholipid Bilayer</p> Signup and view all the answers

    Which process involves the movement of molecules from an area of low concentration to an area of high concentration using energy from ATP?

    <p>Primary active transport</p> Signup and view all the answers

    What is the name for the different types of ion channels present in the plasma membrane?

    <p>Gated channels</p> Signup and view all the answers

    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?

    <p>Facilitated diffusion</p> Signup and view all the answers

    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?

    <p>Fluid mosaic model</p> Signup and view all the answers

    What is the term for the process by which cells ingest external fluid, macromolecules, and large particles, including other cells?

    <p>Endocytosis</p> Signup and view all the answers

    What is the main function of glycolipids in the plasma membrane?

    <p>Recognition for the body’s immune system</p> Signup and view all the answers

    Which type of molecules is the lipid bilayer impermeable to?

    <p>Ions and large, uncharged polar molecules</p> Signup and view all the answers

    What contributes to the creation of membrane potential?

    <p>The electrical gradient across the plasma membrane</p> Signup and view all the answers

    Which statement best describes the role of cholesterol in the plasma membrane?

    <p>Makes the lipid bilayer stronger but less fluid at normal body temperature</p> Signup and view all the answers

    What are the main components of the glycocalyx in the plasma membrane?

    <p>Proteoglycans, glycoproteins, and glycolipids</p> Signup and view all the answers

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