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Page 1

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Uni
t
O ne:
Cel
ls,
Exchange
and
Tr
ansport [BIOLOGY REVISION NOTES]


CELL STRUCTURE
CELL THEORY:
Str
uctur
a l
and
funct
ional
uni
t
of
all
l
i
ving
thi
ngs
New
cell
s ar
ise
fr
om alr
eady exi
sti
ng cel
ls
Cell
sc
o…

Page 2

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Uni
t
O ne:
Cel
ls,
Exchange
and
Tr
ansport [BIOLOGY REVISION NOTES]




STAINING:
U sed t
o
have bett
er
visual
isat
ion
of
cell
s under
a micr
oscope
U sed because some
cell
components
are t
ransparent
A CE TIC OR CEIN
stai
ns DN A
dark…

Page 3

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Uni
t
O ne:
Cel
ls,
Exchange
and
Tr
ansport [BIOLOGY REVISION NOTES]


Prot
ect
s agai
nst
mechani
cal

damage

Cel
l Sur
face Made o f
li
pids and Contr
o l
s move ment of
Memb r
ane pr
otei
ns subst
ances i
n and
ou…

Page 4

Preview of page 4
Uni
t
O ne:
Cel
ls,
Exchange
and
Tr
ansport [BIOLOGY REVISION NOTES]


Synthesi
s,
st
oresa
ndt
ranspor
ts
car
bohydrat
es

Stack of membr
ane Receives and mo di
fi
esp
r ot
eins
bound
sacs f
rom ER
Packages mo dif
ied prot
ein i
nto
vesi…

Page 5

Preview of page 5
Uni
t
O ne:
Cel
ls,
Exchange
and
Tr
ansport [BIOLOGY REVISION NOTES]


Have2mi
c r
otubul
esi
n Used li
ke out
board mo t
ors to
cent
re pr
opelc
e l
l
s forwar
d (
e.g.w
h en
Have 9
around
the
edge sper
m cel…

Page 6

Preview of page 6
Uni
t
O ne:
Cel
ls,
Exchange
and
Tr
ansport [BIOLOGY REVISION NOTES]




1) Mi crotub ul
es a n d mi c r
o f
i
lame nts support t he
o rganell
e s keepi
n g
th em in position
2) H elp
strengthen t
he cel…

Page 7

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Uni
t
O ne:
Cel
ls,
Exchange
and
Tr
ansport [BIOLOGY REVISION NOTES]



To
fr
agil
e and
simple
to
carr
y out
al
l
funct
ions
Many ot
her
comp onent
s ar
e needed t
o enabl
e f
unct
ions
of
membr
ane

STRUCTURE:




Memb ran e…

Page 8

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Uni
t
O ne:
Cel
ls,
Exchange
and
Tr
ansport [BIOLOGY REVISION NOTES]


Carrier:
Actively transport s ubstances
across
membrane
(r
equi
res
ATP
)
A cta
s receptor sites formo
l ecul
es t
o bind t
o pr
otei
n,s
o cel
l
resp onse
can be
c…

Page 9

Preview of page 9
Uni
t
O ne:
Cel
ls,
Exchange
and
Tr
ansport [BIOLOGY REVISION NOTES]


1)B acter
ia
kn own
as "Clostridium Buctucinium"
2) Releases protein
that
binds r ecept
ors
on mu scl
e cel
ls
3)R esult
=
p ar
a l
ysis

IMPERMEABILITY OF CELL MEMBRANES:
C e l…

Page 10

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Uni
t
O ne:
Cel
ls,
Exchange
and
Tr
ansport [BIOLOGY REVISION NOTES]




A gai
nst
concentr
a t
ion
gradient
R equi
res
A TP t
o ma ke
process "
acti
ve"
Invol
ves car
ri
er pr
o t
eins
P r
otei
ns act
as
"pump…

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