5.2 Factors affecting membrane structure

Question 1

what to factors affect cell memebrane permeability

Answer 1

• temprature
• solvents

Question 2

How does temp effect permeability of cell membrane at <0’C
0-45 and 45<’c

Answer 2

less than 0’C
not much energy/movment
packed closley and rigid
But if frozenand then defrosted ice crystals will have pierced the membrane, irreversible damage
0’c-45’c
movment/kinetic energy
loosley packed
partilly permeable increasing with temp
45’C+
proteins begin to denature, membrane begins to melt
water inside expands