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Class notes

Class notes Unit 2 - Development, Plants and the Environment

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concise notes covering topic 3 for IAS biology

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Uploaded on
August 29, 2024
Number of pages
17
Written in
2024/2025
Type
Class notes
Professor(s)
Radwa
Contains
Topic 3

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·

, . A cell structure
Masmid
US Ribosomes


!
3 Bacteria
nuclear pores capsule prevents dehydration of cells.
-X_
-
-

of
nucleus
membrane -movement -covers bacterial surface antigens
I-nuclear bacteria


nuert A
.




well wall
flagellum basal
body
... glycogen - ↳
prevent detection by
-
D granule cell membrane lymphocytes
& mesosomes thylakoids -


chromatin .
pl %



mituctoplasm r
contains
. enzymes chlorophyll
for respiration pili
-
·
contain
membrane
-
outer smooth . & releasing absorb sunlight for photosynthesis.
ATR

conjugation ~



·Doded
allow bacteriato
mem
e adhere to host cell
.


circular
DNA




ranchor
europlasts
ahoid

Apparatus
Stroma
-




Golgi
transporto cissidea Kamella
· cisternal terconnecting
-o endosymbiotic theory
-
trust Mitochondria used to be a
D-secretary reside prokaryotic
-


D




de
organism s
engulfed by entearyotic cell
structure :
folded membrane s e en
and became a permanent part of it
· vesicles (transport + secretary)
Function modification
: of protein

- add carbohydrate - glycoprotein .
Ribosomes




Drina
packaging protein into secretory resides exocytosis
.
·




Se
surface , fuse to of cell w well membrane,


secreting protein by exocytosis
.




rER
⑳9
animal cells only
istened
-
> Lysosomes
.




membranes at equal size




hydrolyti
-
attachedribosomes ·

(POS) ·
vesicle encloses hydrolytic enzymes .




digestive
made by
Function - attached ribosomes assemble amino acids into a ·
Golgi apparatus
Function 1 Fuse is redundant
polypeptide Chain : .


organellesd
-


Polypeptide chain enters cisternal t is folded break it down
.

into 30 structure . acrosome
2 .


- rER
packages protein into transport vesicle. 3 .



apoptis (programmed celldeath) .




Centrioles


pp Chollow CylindersataoA
SER . xribosomes o

·

Synthesis of tipids/steroids
· 4t in liver cells
detoxification . Function from spindle fibres
-




during cell division to
separate chromosomes
.

, MaSagemicrotare
Cytoskeleton

X
· made of tubes & filaments .




·
Tubules are made of tubulin
-




ofilaments are made of in
cilia
Function : Support animal cell -Short-long
-

same structureas

maintain its Shape -
numerous - feu centrioles .




PRORARYOTICS EULARYOTIS
ANIMAL PLANT

no nucleus has nucleus Lysosomes well wall

unicellular multicellular (mostly centrioles unloroplast
except : yeast
smallercell protoctisto
permanent racciole
larger well
.
cytoskeleton
70s Ribosomes &os ribosomes
Hageldumt Plasmodesmatta .




S
-
cytoplasmicUnreals
Xhave membrane have membrane bound Clic channels
bound organees allows communication
organelles
-Circular Loop at DNA Linear DNA


found in Chloroplast mitochondria -

Futaryotic
-
organelles
-

Division of labour -compartmentalisation
· each organelle is
separated
of the cell
from one rest
by a


membrane.
Describe the of protein Synthesis.
* process
① Ribosomes bound torER assemble At to form a polypeptide chain w lo structure
.



Polypeptide
② chains enters FR cisternal where it'll be folded into a protein w zo Structure
,


③ Packaged into a transport vesicle
.

⑦ Fuse
wholgi Apparatus cisterne atcis side & protein moves thru cisternal where it'll be modified

⑤ ex carbohydrate side chain glycoprotein
tomalle a
adding a
-
.




⑥ Packaged into a secretory vesicle
,that'll move to surface of the b fuse call membrane
,
secreting protein
,
by exocytosis
·




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