Concept explainers
To determine: Whether the spread of the scent molecules through a room is an example of diffusion.
Concept introduction: Transport of molecules across a membrane can be active or passive. Active transport requires energy expenditure, as it transfers the molecules against their concentration gradient. In passive transport, the transfer of molecules takes place along their concentration gradient. Therefore, energy is not required in this process. Simple diffusion, facilitated diffusion and osmosis are the three main types of passive transport.
To determine: Whether the diffusion has ceased at equilibrium.
Concept introduction: Transport of molecules across a membrane can be active or passive. Active transport requires energy expenditure, as it transfers the molecules against their concentration gradient. In passive transport, the transfer of molecules takes place along their concentration gradient. Therefore, energy is not required in this process. Simple diffusion, facilitated diffusion and osmosis are the three main types of passive transport.
To explain: Whether the scent molecules stopped moving about.
Concept introduction: Transport of molecules across a membrane can be active or passive. Active transport requires energy expenditure, as it transfers the molecules against their concentration gradient. In passive transport, the transfer of molecules takes place along their concentration gradient. Therefore, energy is not required in this process. Simple diffusion, facilitated diffusion and osmosis are the three main types of passive transport.
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