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Questions and Answers
What is the main driving force behind diffusion?
What is the main driving force behind diffusion?
- High temperature
- Concentration gradient (correct)
- Molecular size
- Low concentration gradient
In simple diffusion, what factors determine the rate of movement of substances across the membrane?
In simple diffusion, what factors determine the rate of movement of substances across the membrane?
- Temperature and pressure
- Energy requirements and lipid composition
- Electric charge and polar nature of molecules
- Molecular size, concentration gradient, and lipid solubility (correct)
What type of transport requires the use of energy to move substances across the membrane?
What type of transport requires the use of energy to move substances across the membrane?
- Osmosis
- Facilitated diffusion
- Active transport (correct)
- Bulk transport
What happens to the rate of diffusion when the concentration gradient is increased?
What happens to the rate of diffusion when the concentration gradient is increased?
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Which molecules can pass directly through the phospholipid bilayer in simple diffusion?
Which molecules can pass directly through the phospholipid bilayer in simple diffusion?
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