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Summary - 2.1.1 Cell Structure

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Provides an in depth, comprehensive and high-yield summary for A - Level biology, specifically tailored to OCR A specification. These notes compile information from the official textbook, mark schemes, and class lectures into a concise revision resource. Includes: Coverage of all points on the specification for 2.1.1 Cell Structure Definitions for key terminology required by examiners Clear, labelled diagrams for complex processes

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Eukaryotic cell structure
magnification - number of times greater an
Microscopy Transmission Electron Microscope
image is compared to the real object very thin object ·black white racu-
.




-globular protein - um




...



1
cytoskeleton microtubules movementof organelles
resolution -
ability
to distinguish between organelles ·stream of electrons dead objects
~
- -



crystal violet t





ge
60%.? through
size
two - image
microfilaments points sample expensive, large
-> cytokinesis
⑧ t
12 - -
made of actin I


methylene blue
actual
A M-magnification

O




↑ ~
:·.. Se
-


-cel movement outside cells-nigrosin 2D
image hard to

0
size

centriole + contraction use

.. i
~
!
2 -




E stain? d Scanning Electron Microscope
de
⑳ why do contrast and
congo red

used in cell division
10 -
O
· we
5

15,000,000 3D
.. 9
· dead
110 -


#I
made of microtubules
-
between different parts absorb plants iodine image ·blackt white




-i
- - ·

1
- objects
o8
· 2
res.
·· M different amounts of stain viewed in
surface
only


-come
2 centriole centrosome
·
vacuum
"
· .
-
1000
x


high

~
3 cell
surface membrane bilayer dry mount no liquid-hair/pollen Laser Scanning electrons .
15,000,000 x
W
res.
-
-


I ...

partially permeable
x1000 wet mount-water, oil/stain used Confocal reflected back expensive
·


large
.. ·
holds interior
together place gently air bubbles ·
laser beam to
Light microscope
x 1000
squash slide between slide t illuminate stains colour limited mag-tresolution
↑Cytoplasm-gel-like substance
8
-


4 1000
-




· ↓
↳M cover slip-soft tissue root ends living cells 2D
organelles held together/suspended eg.
·


to


·

" up
track molecules
objects affordable
.


Smear slides slide blood ·alive 2000x

I
where chemical reactions take smear across -
place
-


secretary high res.
·




vesicles: ·i ⑧ 5

endoplasmic reticulum
smooth
differential stainingtypes
staining for
of cells
expensive +

~ ⑪ gram
-





complex
·makest packages lipids + carbohydrates bacteria
Protein synthesis




-
-
st
8 ↑




I·......
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golgi ·made
of flattened membrane discs 888

I
mitochondria respiration, makes ATP proteins synthesised ribosome
at RER


·go
apparatus 6 aerobic on




soffgin
- -




2 proteins pass into cisternal of RER and packaged
·modifies, packages labels matrix, outer tinner membranes, cristal ⑧
.
·




-see
double

sends to other intermembrane 2 into vesicles
proteins,
mem.


space
+

To matrix
organelles
-


I 3 vesicles towards golgi via cytoskeleton
·collection of fusedcisternae 7 nuclear envelope -
double membrane with
·
move


cisttrans networks nuclear pores
4
vesicles fuse with cis (half) surface
golgi control molecules int out
·




Cell structure
-

9
nucleus-contains DNA surrounded
by histone proteins forms -
of the golgi apparatus
and
10

nucleolus - makes ribosomal DNA,
largercircular chromosomes proteins enter are modified before
golgi vesicles via the trans
"bosomes, help synthesise proteins assemble them leaving in face of
the
-
some bound to 10 20 material
golgi
some gree in
no nucleus-genetic free
-




cytoplasm organelles
Brough endoplasmic reticulum-flattened membrane discs num in gloating sometimes in
- the form of vesicles
5 move to plasma membrane in

cisternae ribosomes size a plasmid order to release the proteins to where
containing
-
on
surface
-
produces
proteins lysosomes vesicle containing -
type
different of ribosomes -
made
they are needed

"vesicles-bubbles of membrane of proteins RNA
hydrolytic enzymes to break
+


bonds smaller TOS
energy -

from enzymes antibodies storage
capsule -
around the cell chemiosmosis proteins
I
↳ occurs in
Structural
cellulose cell wall-fully permeable
·

defence againsthost cells
cell proteins
supports cell + cells aroundit Plant cell structure cell wall-made
of peptidoglycan/ membrane
·

contents push againstit murein
plant cells only & I
·prevents bursting
~pili
-



collapsing Specialised organelles
or

·cellulose cell wall capsule
-
-




~
permanent vacuole
2
cell





permanentvacuole membrane surface
·




Lonoplast flagella
-


used to the
chloroplasts I - move cell
-




bound that stores
&
- membrane





sac cell ↳
10 used
sensory organelle detectchemical to





-> cell as a
-

I -
chromosomal
sap O SER 8 free
-
100 wall the cell's environment
& changes in
mi DNA




~
·membrane
-
called the
Es ·whip-like extensions
en
s protuce
that
0
in size from the


0
cell
o
·
12 ER -
&




tonoplast
8




·O
cilia-
o
&
2

..↳
chloroplasts
flagellum
3
nucleus
· ·stationary
-



t nucleolus -
sensing - in nose
·foundin areas above ground


& ->
↓ mobile -
move mucus in respiratory system
double membrane -
③ only in
·

some
ribosomes, each cilium contains two central
·



·

stroma-fluid in centre &



microtubules and a wheel of microtubules
thylaboids membranes of
I S
·
-



⑧ 9 +2
arrangement
slattened mitochondria-
in a

0.1-10am
sacs 00
microtubules so
pairs of parralel 00
grana-stacked thy la hoids in size

D
slide each other ⑧

as
over 00
↳ contain photosynthetic enzymes
Like -

an
Prokaryotic cell structure causing the cilia move
to 8
chlorophyll golgi motion o

apparatus
in a
beating

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August 9, 2026
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Summary
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