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Page 1

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Emi
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y Summer
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AS OCR Biology Revision Pack

UNIT f211 Cells, exchange, transport

Module 1 Cells

Cell Structure
1. Stat
e t
he r
esolut
ion
and
magnif
icat
ion
that
can
be
achi
eved
by
a l
i
g ht
mi
croscope,
a
tr
ansmi
ssi
on…

Page 2

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Emi
l
y Summer
s





5. Out
li
ne
the
funct
ions
of
the
str
uct
ures.





Picture Description Function

La r
ge and contai
ns N ucl
eus contai
ns t
he
chromati
n. Encl
ose d
by a cel
l'
s genet
ic
ma t
erial
.
nu…

Page 3

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Emi
l
y Summer
s




Enzyme s br
e ak
dow n
Sp her
ical
sacs cel
ls.
E.g.
wh i
te
blood
surr
ound ed
by a si
ngle cel
l
lyosome s
break
me mb r
ane, wi
th no
clear dow n
invadi
n g
i
nter…

Page 4

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Emi
l
y Summer
s





T hi
ck
layer
,
in
plants.
Gives
the
cell
st
rengt
h
Made of
cel
lul
ose i
n and r
igi
dit
y
eukar
yoti
c cel
ls
and
mur
ein
in
prokar
yo t
ic
cel
ls.


I
t
separates
the cel…

Page 5

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Emi
l
y Summer
s





Rigi
d t
ail
t
h at
r
otates.
"The Propel
s t
he cel
l

mo t
or
is
e mbed ded i
n t
h e
cel
l
me mb r
an e and
is
+
dri
ven by a
H gr
adient…

Page 6

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Emi
l
y Summer
s


















Cell Membranes

9. D escr
ibe,
wi
th
the
aid
of
diagr
ams,
t
he
fl
uid
mosai
c model

of
membr
ane
struct
ure




10.Descr
ibe
the
rol
es
of
the
component
s of
t
he
cel
l
membr
ane phosphol
ipi
ds,
chol…

Page 7

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Emi
l
y Summer
s







12.Expl
ain
the
ter
m cell signalling.

Cel
l
Signal
li
ng
H ow cel
ls
communi
cat
e wi
th
each
other
,


One cel
l
rel
eases a
me ssenger
mo l
ecul
e
(e.
g.
a hor
mo ne)

The
mo l…

Page 8

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Emi
l
y Summer
s




Di
ff
usi
on t
he movement
of
par
ti
cl
es
fr
om
an
area
of
higher
concent
rat
ion
to
an
area
of
l
ower
concent
rat
ion

Faci
l
it
ated
dif
fusi
on
uses
car
ri
er
and
channel
pr
otei…

Page 9

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Emi
l
y Summer
s


























Cell Division, Diversity and Cellular Organisation




9

Page 10

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Emi
l
y Summer
s





Expl
ain
the
meani
ng
of
the
ter
m homologous pair of chromosomes

Huma ns
have
46
chromosome s
in
tot
al
23 pairs.
One chr
omo some i
n each
pair
comes
f
rom t
he
mother,
and
then
the
other
come s
fr…

Comments

isha8362

That was very useful...thanks :) 

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