Structure of cell membrane jack

Question 1

phospholipuds

Answer 1

allow lipid soluble substances in and out

Question 2

proteins

Answer 2

provide structual support
act as channels transporting water souble substancea
allow active transport at carrier proteins
act as receptors

Question 3

cholesterol

Answer 3

reduce lateral movement of other molecules
make membrane less fluid at high temps

Question 4

glycoproteins

Answer 4

act as recognition sites
help cells attach to one wnd other
allow cells to recogbise one wnd other such as lymphocytes

Question 5

fucntion of cell membrane

Answer 5

control entry and exit of materials in discrete organelles such as mitochondria
provide internal transpirt eg er
provide surfaces where reactions can occur eg ribosomes rer

Question 6

fluid mosaic model

Answer 6

fluid as individual phospholipid molecules can move relative to one and other contstantly changing shape
mosaic because of proteins embeded in phospholipids varying in shape size