Unit 1-Transport Across Cell Membrane

Question 1

Components of the cell membrane

Answer 1

Phospholipids and proteins

Question 2

Term for only allowing certain (small) molecules to pass across membrane

Answer 2

Selectively permeable

Question 3

Term meaning transport of molecules does NOT require energy

Answer 3

Passive

Question 4

Difference in concentration of a substance inside and outside a cell

Answer 4

Concentration gradient

Question 5

The movement of a substance from an area of high concentration to an area of low concentration DOWN the concentration gradient

Answer 5

Diffusion

Question 6

The movement of WATER from an area of high concentration to an area of low concentration DOWN the concentration gradient

Answer 6

Osmosis

Question 7

Term for solutions that have a lower water concentration than the cell

Answer 7

Hypertonic

Question 8

Term for solutions that have a higher water concentration than the cell

Answer 8

Hypotonic

Question 9

Term for solutions that are have equal concentration as the cell

Answer 9

Isotonic

Question 10

Term for solutions that have higher solute concentration than the cell

Answer 10

Hypertonic

Question 11

Term for solutions that have a lower solute concentration than the cell

Answer 11

Hypotonic

Question 12

Appearance of plant cells in strong salt solution

Answer 12

Plasmolysed

Question 13

Effect of strong salt solution on animal cells

Answer 13

Shrivel or shrink

Question 14

Effect of a solution with higher water concentration on animal cells

Answer 14

Bursts (no cell wall)

Question 15

Appearance of plant cell immersed in pure water

Answer 15

Turgid

Question 16

Term for the movement of a substance across the cell membrane AGAINST the concentration gradient and requiring energy

Answer 16

Active transport

Question 17

Part of membrane that pumps molecules from low to high concentrations

Answer 17

Protein (pumps)

Question 18

Molecule that diffuses into leaf for photosynthesis

Answer 18

Carbon Dioxide

Question 19

Substances that diffuse out of animal cells before building up to harmful levels

Answer 19

Carbon dioxide

Urea

Question 20

Molecule that diffuses into cells needed for aerobic respiration

Answer 20

Oxygen

Question 21

Molecules which diffuse into cell required for protein synthesis

Answer 21

Amino acids