Chapter 5 - Cells in their environment Flashcards Preview

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Flashcards in Chapter 5 - Cells in their environment Deck (10)
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What is a selectively permeable membrane?

A membrane that only allows certain substances pass through it.

1

What is the concentration gradient?

A difference in concentration of a substance between two areas.

2

What is osmosis?

The diffusion of water across a selectively permeable membrane from an area of higher water concentration (or low solute concentration) to an area of lower water concentration (or high solute concentration), osmosis MUST occur through a selectively permeable membrane.

3

What is turgor pressure?

The outward pressure that is exerted on a plant cell wall by the cell contents, when water is taken in by osmosis.

4

What is endocytosis?

The process by which a cell moves large amounts of material, or non-dissolved particles, into it's cytoplasm from the outside environment.

5

What is phagocytosis

A type of endocytosis in which a cell uses pseudopods to move non-dissolved particles into it's cytoplasm from the outside environment.

6

What is exocytosis?

The process by which large amounts of material, or large non-dissolved particles, are moved from a cell's cytoplasm to the outside environment.

7

What is a permeable membrane?

A membrane that lets things pass through it.

8

What is a non-permeable membrane?

A membrane that lets nothing pass through it.

9

What is the job of the cell membrane?

To let food and water into the cell when needed, and to expel any unwanted materials.