Question

Molecules can diffuse across a cell membrane when they move –

a concentration gradient. In –
diffusion, very small or uncharged molecules cross the cell membrane. In –
diffusion, they must rely on the assistance of a –
to cross. Sometimes, energetic input is needed for molecules to move –
the concentration gradient, a process known as –
transport.
simplecomplexagainstactivetransport proteinfacilitatedosmotichydrophilichydrophobicdown

Answer 1

[AI-generated answer — Bot GPT 3.5]

the concentration gradient. In active transport, energetic input is needed for molecules to move against the concentration gradient. Simple diffusion allows for very small or uncharged molecules to cross the cell membrane, while facilitated diffusion relies on the assistance of a transport protein. Osmotic transport involves the movement of water molecules across the membrane. Hydrophilic molecules can easily pass through the cell membrane, while hydrophobic molecules may require specific channels or carriers for transport.