OCR Biology F211 complete revision notes

This is the complete OCR unit 1 biology revision note set. They took me a long time to complete. You are welcome to use them in your revision. If you could leave a comment saying thank you or how helpful they were, I would appreciate it. Good luck :)

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Page 1

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CELL STRUCTURES
a) state the resolution and magnification that can be achieved by a light microscope, TEM and
SEM.
T h e ma g n ific a ti
o n fo r a l
ig h t microscope i
s x1500 and t
h e
resolut
ion
in
200nm. The…

Page 2

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Ribosomes: T i
ny
o rg a n e l
le s . S o me
a re
a t
tached t
o RE R some
are
free
in t
he cytopl
asm. They
c on si
st of
tw o sub un i
ts . T h e y…

Page 3

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Cel
l
recogni
ti
on and
signal
li
ng
Regul
ati
ng t
ransport
i
n and
out
of
cel
ls
Separ
ati
ng cel
l
content
f
rom the
out
side
envi
ronment


b) state that plasma membranes are partially permeable barriers.

c) describe the fluid mosaic model of…

Page 4

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g ra di
en t
. The ca rr
ier pr
o t
eins use e nerg y
fro m A T P in orde r
to
ch ang e
s ha pe. They can carry

mo lecules at
a
mu ch fast
er r
a t
e
tha n…

Page 5

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b) describe the main stages of mitosis (behaviour of the chromosomes, nuclear envelope, cell
membrane and centrioles.
T h e fi
rst stage of
mi t
o si
s
is
prophase. Th e chromo some s short
en and thi
ck en
(sup er
c o i
l)
an d…

Page 6

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h o molog ous pa i
r i
s co pi
ed i
n to
th e
d au gh t
e r
cel
l.
T he d aughter cel
l
rece i
ve s
o ne f
rom ea ch
p a r
ent, t
his ma ke s…

Page 7

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T all
,
thi
n and
long
in
shapes means
ther
e ar
e f
ewer
cel
l
w al
ls
for
t
he sunl
ight
t
o
pass
through.

Root
hai
r
cell

L ong hai
r l
i
ke pr
oject
ion
to
incr
ease
the
cel
l…

Page 8

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diff
u sion .
T he y have a l
arge su r
fac e area to volume
ratio.
Wh erea s i
n mu lt
icel
lul
ar or
ga ni
sms ,
the i
r
n e e ds
c an no t
b e
me t
b…

Page 9

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f) outline the mechanism of breathing (inspiration and expiration) in mammals, with reference to
the function of the ribcage, intercostal muscles and diaphragm.
D uri
ng i
n ha l
ation
T h e diaphrag m contra ct
s
an d fl
att
e ns
E x ternal
intercost
a…

Page 10

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s urfa ce area:volume r
ati
o .
In
la r
g er or
g ani
sms ,
diff
u s i
on c ann ot
me e t
a l
l t
h e organisms
re qu ireme nt
s .
Th ey need
a we ll
organ i…

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