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Questions and Answers
What is the main component of the cell membrane being focused on in this video?
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?
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?
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?
What is the term used to describe the movement of phospholipids without the need for a catalyst?
What is the nickname for transbilayer diffusion?
What is the nickname for transbilayer diffusion?
What is the region of the cell membrane that borders the extracellular environment?
What is the region of the cell membrane that borders the extracellular environment?
What is the region of the cell membrane that borders the intracellular environment?
What is the region of the cell membrane that borders the intracellular environment?
Why is the cell membrane drawn in a simplified form in this video?
Why is the cell membrane drawn in a simplified form in this video?
What is the main difference between transbilayer diffusion and lateral diffusion?
What is the main difference between transbilayer diffusion and lateral diffusion?
What is required for catalyzed movement of phospholipids?
What is required for catalyzed movement of phospholipids?
What is the function of flippase?
What is the function of flippase?
What is the primary source of energy for catalyzed movement of phospholipids?
What is the primary source of energy for catalyzed movement of phospholipids?
What is the function of floppase?
What is the function of floppase?
Which of the following statements is TRUE about scramblase?
Which of the following statements is TRUE about scramblase?
What is the result of uncatalyzed movement of phospholipids?
What is the result of uncatalyzed movement of phospholipids?
What is the fluid mosaic model?
What is the fluid mosaic model?
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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
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