Diffusion is the spontaneous movement of a substance, called a

Question

____________, across the plasma membrane from the side of the membrane
that has a higher concentration of the substance to the side of the membrane
that has a lower concentration of the substance. In this case, the substance is
moving down its ________________________.
c. Osmosis is specifically the passive diffusion of water across a membrane.
i. involves the movement of water across the plasma membrane from
an area of high water concentration to an area of low water
concentration.
ii. Although osmosis involves only the movement of water, it is
influenced by the concentration of other molecules inside or
outside the cell that are unable to move across the membrane.
iii. During osmosis, water flows from areas of __________ solute
concentration to areas of________________ solute concentration.
iv. When cells are placed in freshwater, what happens to them in terms
of osmosis? What differences are seen between plant and animal
cells?
16.Active Transport
a. During active transport, cells use energy to transport molecules across a

Answer 1

Diffusion is the spontaneous movement of a substance, called a solute, across the plasma membrane from the side of the membrane that has a higher concentration of the substance to the side of the membrane that has a lower concentration of the substance. In this case, the substance is moving down its concentration gradient.

c. Osmosis is specifically the passive diffusion of water across a membrane. i. It involves the movement of water across the plasma membrane from an area of high water concentration to an area of low water concentration.
ii. Although osmosis involves only the movement of water, it is influenced by the concentration of other molecules inside or outside the cell that are unable to move across the membrane.
iii. During osmosis, water flows from areas of low solute concentration to areas of high solute concentration.
iv. When cells are placed in freshwater, water enters the cells due to osmosis, as the concentration of solutes inside the cells is higher than that in freshwater. This can lead to cell swelling and potentially bursting (lysis) in animal cells, as they lack a cell wall. In contrast, plant cells, which have a rigid cell wall, will also swell, but they typically become turgid without bursting due to the pressure exerted by the cell wall.

16. Active Transport a. During active transport, cells use energy (usually in the form of ATP) to transport molecules across a membrane against their concentration gradient. This means that substances are moved from areas of lower concentration to areas of higher concentration.