7.3 Cell Boundaries

Question 1

Lipid bilayer

Answer 1

2 layers of lipids that make up the cell membrane

Question 2

Cell wall

Answer 2

Layer around the cell membrane to provide support and protection in some organisms (plants)

Question 3

Passive transport

Answer 3

The movement of materials across the membrane without using cellular energy

Question 4

Diffusion

Answer 4

Particles move from an area of high concentration to an area of low concentration

Question 5

Solution

Answer 5

Mixture of 2 or more substances in which the molecules of each substance are evenly distributed

Question 6

Solute

Answer 6

Substance that is dissolved

Question 7

Solvent

Answer 7

Substance in which the solute is dissolved

Question 8

Equilibrium

Answer 8

When the concentration of the solute is the same throughout the system

Question 9

Concentration

Answer 9

Mass of solute in a given volume of solution

Question 10

Osmosis

Answer 10

The diffusion of water through a semipermeable membrane (water moves from high to low concentration of water)

Question 11

Isotonic

Answer 11

When comparing 2 solutions and the concentration of the solute is the same (same strength)

Question 12

Hypertonic

Answer 12

When comparing 2 solutions, the one that has the higher concentration of solute

Question 13

Hypotonic

Answer 13

When comparing 2 solutions, the one that has the lower concentration of solute

Question 14

Turgor pressure

Answer 14

Water pressure within a cell

Question 15

Cytolysis

Answer 15

When a cell bursts because of too much Turgor pressure

Question 16

Plasmolysis

Answer 16

The shrinking or wilting of a cell from low Turgor pressure

Question 17

Facilitated diffusion

Answer 17

Protein channels in the cell membrane allow certain molecules to cross the membrane without the use of cellular energy

Question 18

Active transport

Answer 18

Using energy to move materials against the concentration gradient

Question 19

Molecular transport

Answer 19

Molecules are moved across the cell membrane through transport proteins

Question 20

Endocytosis

Answer 20

Taking material into the cell by enfolding the material in the cell membrane forming pockets around the material

Question 21

Phagocytosis

Answer 21

Extensions of cytoplasm engulf large particles to be taken in the cell

Question 22

Pinocytosis

Answer 22

Extensions of cytoplasm engulf liquid to be taken into the cell

Question 23

Exocytosis

Answer 23

Wastes are packaged in vesicles that fuse with the cell membrane forcing the material out of the cell

Question 24

Cell membrane

Answer 24

Controls what enters and leaves the cell and provides support and protection for the cell