The cell membrane (10)

Question 1

cell membrane functions

Answer 1

encloses cell contents
plays a protective role through its semi permeable membrane
controls the movement in and out the cell
plays a structural role

Question 2

floating mosaic model

Answer 2

protein, the cholesterol that lies between the phospholipid bilayer that are not in a fixed position hence the reason they are called a floating mosaic model

Question 3

glycolipid

Answer 3

carbohydrates and protein

Question 4

diffusion

Answer 4

(intracellular transport) the movement of a substance from an area of high concentration to an area of low concentration

Question 5

osmosis

Answer 5

(intercellular transport) the movement of water/solution from an area of high concentration to an area of low concentration

Question 6

concentration gradient

Answer 6

the difference in the amount of concentration from one area to another

Question 7

factors that affect transport in cells

Answer 7

• the hotter the temperature the quicker they move

- the higher amount of concentration the quicker

Question 8

isotonic

Answer 8

the concentration of the solvent and solute is the same on both sides of the membrane

Question 9

hypotonic

Answer 9

the concentration of the solute is lower than that of the solvent

Question 10

hypertonic

Answer 10

the solute concentration is higher then the solvent (anything above 0,9%)

Question 11

facilitated diffusion

Answer 11

• a passive movement no energy required, in which the molecules that are too large to move through the lipid membrane (like glucose) or are charged (like ions) move from the region of higher concentration to the region of lower concentration assisted by a carrier (usually a protein)

Question 12

active transport

Answer 12

when a molecule needs to move against the concentration gradient (from a low concentration to high) energy in the form of ATP is needed

Question 13

edocytosis

Answer 13

the cell is absorbing a large amount of substance at once

Question 14

exocytosis

Answer 14

a cell is releasing large amounts of molecules out once (surrounded by a vesicle)

Question 15

what influences the rate of diffusion

Answer 15

concentration gradient, temperature, pressure

Question 16

electron microscope vs light microscope

Answer 16

electron microscopes differ from light microscopes in that they produce an image of a specimen by using a beam of electrons rather than a beam of light, they have a much shorter wavelength and can produce higher res pictures

Question 17

scanning electron microscope

Answer 17

is used to look at the external structure of the cell

Question 18

transmission electron microscopes

Answer 18

is used to look at the internal structure of the cell