Download lesson-7-cytoskeleton

Starter
 Collect your plenary sheet from last
lesson- answers on power point on
BLOG
 How many spec points from 1.1.1 have
we covered so far?
Organelles questions
1. Which organelles have a membrane?
(6)
2. Which organelles have a double
membrane? (3)
3. What are the membrane bound sacs
of the ER called?
4. Which is the largest organelle?
1. Nucleus, ER, golgi apparatus,
mitochondria, chloroplasts,
lysosomes
2. Nucleus, mitochondria, chloroplasts
3. Cisternae
4. Nucleus
Learning objectives
 Outline the interrelationship between
the organelles involved in the
production and secretion of proteins
(spec point g)
 Recall the role of the cytoskeleton of
the cell
 Explain the importance of the
cytoskeleton of the cell
Division of labour
 Cell organelles work together to get
jobs done. This is called division of
labour
 WE only need to look at protein
synthesis and secretion for the spec
Task
 You have been given a sheet with
stages blanked out
 Write statements to explain what is
happening at each stage – knowledge
from functions of organelles (linking)
3. Ribosome makes a protein (it uses the
mRNA as a recipe/template)
4. Rough ER packages the protein into a
vesicle and sends it to the golgi
5. The vesicle fuses to the golgi depositing
the protein
6. Golgi processes and packages the protein
7. Golgi vesicle pinches off the golgi
containing the modified protein
8. Vesicle fuses with the cell SURFACE
membrane
9. Cell surface membrane opens to release
the protein
How many organelles are
involved in the process?




Nucleus
Ribosome
Rough ER
Golgi
I get 4 key ones
Learning objectives
 Outline the interrelationship between
the organelles involved in the
production and secretion of proteins
(spec point g)
 Recall the role of the cytoskeleton of
the cell
 Explain the importance of the
cytoskeleton of the cell
 How are things held in place in the
cell?
 How do things know where to move in
a cell? Is it random movement?
Cytoskeleton – key spec
points
 Mechanical strength
 Transport
 Cell movement
Cell strength
A series of protein fibres keep the cells
shape stable by providing a internal
framework (cytoskeleton)
Cell movement

Actin filaments can move against
eachother
They are responsible for the movement seen
in white blood cells
 Microtubules (approx 25nm diameter
cylinders)
Made from a protein tubulin
They can move a microorganism through a
liquid (flagellum) or move a liquid past a
cell (cilia)
Transport of organelles
and vesicles within a cell
Actin filaments can move some
organelles around inside the cell
Other proteins on the microtubules
inside the cell can move the
organelles/vesicles along the fibres
These proteins are known as
microtubule motors (page 18
extension)
Examiners tip
 All movement requires energy (ATP)
cilia outside the cell and organelles
within the cell
 You can get a mark for mentioning
that
Individual study task
 Research from your text eukaryotic
DNA
 What is a prokaryotic cell?
 How can you distinguish between a
prokaryotic and eukaryotic cell?
 How is eukaryotic DNA different from
prokaryotic DNA?
Plenary
 Explain the importance of the
cytoskeleton of the cell
 Paper to hand in