movement through the cell membrance {osmosis and defusion)

Question 1

Substances move in and out of cells in 2 ways

Answer 1

Diffusion
Active Transport

Question 2

Diffusion

Answer 2

movement of molecules from a region of higher concentration to a
region of lower concentration.

Question 3

Active Transport

Answer 3

Movement of molecules from a less crowded to a more crowded
area WITH the use of energy.
Molecules are “carried” into or out of the cell using some of the cell’s
energy.

Question 4

Membranes can be

Answer 4

Permeable
Semi Permeable
Impermeable

Question 5

Permeable

Answer 5

let everything in and out

Question 6

Semi Permeable

Answer 6

let some things in and out

Question 7

Impermeable

Answer 7

let nothing in and out

Question 8

Biological membranes

Answer 8

are selectively permeable Cells have special mechanisms to allow substances which cannot pass through the membrane to enter the cell when necessary

Question 9

Diffusion

Answer 9

the spreading of molecules from an area of high concentration to an area of low concentration

Question 10

Osmosis

Answer 10

the movement of water across
a semi-permeable membrane from a
region of low concentration to a
region of high concentration

Question 11

does osmosis require energy

Answer 11

Osmosis is a special type of diffusion that
does not require energy

Question 12

how is osmosis

Answer 12

Osmosis is passive

Question 13

what are animal cells enclosed by

Answer 13

Animal cells are only
enclosed by a
membrane

Question 14

what is the function of our kidneys

Answer 14

It is the function of our kidneys to make
sure the fluid in our bodies that surrounds
our cells (plasma) has a stable
concentration

Question 15

Amoeba

Answer 15

a single celled organism that
lives in freshwater

Question 16

what is less concentrated, fresh water or amoeba

Answer 16

fresh water

Question 17

what does the Osmoreregulation system in amoeba
consists of

Answer 17

a contractile vacuole

Question 18

what does the contractile vacuole do

Answer 18

expels water
which prevents the cell from bursting

Question 19

If a plant cell is surrounded by a less
concentrated solution,

Answer 19

water from outside
will move into the cytoplasm and vacuole of
plant cells

Question 20

how do roots absorb water

Answer 20

through osmosis

Question 21

Water entering roots by osmosis

Answer 21

The water outside is less concentrated
than the water in the cytoplasm

Question 22

Turgor

Answer 22

When the outside water enters the plant cell, the vacuole becomes bigger and the cytoplasm swells This causes the membrane to be pushed out towards the cell wall

Question 23

Turgid

Answer 23

When cells are fully “swelled” with the membranes pushing against the cell wall

Question 24

what does turgor pressure do

Answer 24

gives plants their strength

Question 25

what would happen if plants didn’t have turgor pressure

Answer 25

they would be wilted

Question 26

If plant cells are surrounded by a more
concentrated solution

Answer 26

the water inside
the cell would move out to the more
concentrated solution outside

Question 27

plasmolysis

Answer 27

The vacuole and cytoplasm shrivel and the cell membrane moves away from the cell wall The cell loses its turgor pressure

Question 28

the most common causes
of food spoilage

Answer 28

Bacteria and Fungi