Cell Membrane Phospholipid Movement
16 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main component of the cell membrane being focused on in this video?

  • Phospholipids (correct)
  • Proteins
  • Cholesterol
  • Cell wall

    • What is the term used to describe the movement of phospholipids from the outer leaflet to the inner leaflet?

  • Transmembrane diffusion
  • Transbilayer diffusion (correct)
  • Lateral diffusion
  • Osmosis

    • What is the difference between intracellular and intercellular?

  • Intracellular refers to the outer leaflet, while intercellular refers to the inner leaflet
  • Intracellular refers to the inner leaflet, while intercellular refers to the outer leaflet
  • Intracellular refers to inside the cell, while intercellular refers to between cells (correct)
  • Intracellular refers to between cells, while intercellular refers to inside the cell

    • What is the term used to describe the movement of phospholipids without the need for a catalyst?

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

    What is the nickname for transbilayer diffusion?

    <p>Flip-flop</p> Signup and view all the answers

    What is the region of the cell membrane that borders the extracellular environment?

    <p>Outer leaflet</p> Signup and view all the answers

    What is the region of the cell membrane that borders the intracellular environment?

    <p>Inner leaflet</p> Signup and view all the answers

    Why is the cell membrane drawn in a simplified form in this video?

    <p>To focus on the phospholipids</p> Signup and view all the answers

    What is the main difference between transbilayer diffusion and lateral diffusion?

    <p>Direction of movement of phospholipids</p> Signup and view all the answers

    What is required for catalyzed movement of phospholipids?

    <p>Both ATP and protein catalyst</p> Signup and view all the answers

    What is the function of flippase?

    <p>To move phospholipids from inner to outer leaflet</p> Signup and view all the answers

    What is the primary source of energy for catalyzed movement of phospholipids?

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

    What is the function of floppase?

    <p>To move phospholipids from inner to outer leaflet</p> Signup and view all the answers

    Which of the following statements is TRUE about scramblase?

    <p>It does not use ATP</p> Signup and view all the answers

    What is the result of uncatalyzed movement of phospholipids?

    <p>Slow and infrequent movement</p> Signup and view all the answers

    What is the fluid mosaic model?

    <p>A type of cell membrane structure</p> Signup and view all the answers

    Study Notes

    Phospholipid Movement in the Cell Membrane

    • Phospholipids in the cell membrane are tightly packed and move around
    • The cell membrane has two layers: the outer leaflet (facing the extracellular environment) and the inner leaflet (facing the intracellular environment)

    Uncatalyzed Movement

    • Uncatalyzed movement occurs without a catalyst
    • Types of uncatalyzed movement:
      • Transbilayer diffusion (flip-flop): phospholipids move from one leaflet to the other (e.g., from outer to inner leaflet or vice versa)
      • Lateral diffusion: phospholipids move side to side within a leaflet, allowing movement in any direction around the cell membrane

    Catalyzed Movement

    • Catalyzed movement requires a protein catalyst
    • Types of catalyzed movement:
      • Flippase: uses ATP and helps phospholipids move from the outer leaflet to the inner leaflet
      • Floppase: uses ATP and helps phospholipids move from the inner leaflet to the outer leaflet
      • Scramblase: does not require ATP and helps phospholipids move in both directions between the leaflets

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Explore the movement of phospholipids in the cell membrane, including uncatalyzed movement and transbilayer diffusion.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser