Starter Starter

Collect your plenary sheet from last Collect your plenary sheet from last lesson- answers on power point on lesson- answers on power point on BLOGBLOG

How many spec points from 1.1.1 have How many spec points from 1.1.1 have we covered so far?we covered so far?

Organelles questionsOrganelles questions

1.1. Which organelles have a membrane? Which organelles have a membrane? (6)(6)

2.2. Which organelles have a double Which organelles have a double membrane? (3)membrane? (3)

3.3. What are the membrane bound sacs What are the membrane bound sacs of the ER called?of the ER called?

4.4. Which is the largest organelle?Which is the largest organelle?

1.1. Nucleus, ER, golgi apparatus, Nucleus, ER, golgi apparatus, mitochondria, chloroplasts, mitochondria, chloroplasts, lysosomeslysosomes

2.2. Nucleus, mitochondria, chloroplastsNucleus, mitochondria, chloroplasts

3.3. CisternaeCisternae

4.4. NucleusNucleus

Learning objectivesLearning objectives

Outline the interrelationship between Outline the interrelationship between the organelles involved in the the organelles involved in the production and secretion of proteins production and secretion of proteins (spec point g)(spec point g)

Recall the role of the cytoskeleton of Recall the role of the cytoskeleton of the cellthe cell

Explain the importance of the Explain the importance of the cytoskeleton of the cellcytoskeleton of the cell

Division of labourDivision of labour

Cell organelles work together to get Cell organelles work together to get jobs done. This is called division of jobs done. This is called division of labourlabour

WE only need to look at protein WE only need to look at protein synthesis and secretion for the specsynthesis and secretion for the spec

TaskTask

You have been given a sheet with You have been given a sheet with stages blanked outstages blanked out

Write statements to explain what is Write statements to explain what is happening at each stage – knowledge happening at each stage – knowledge from functions of organelles (linking)from functions of organelles (linking)

3.3. Ribosome makes a protein (it uses the Ribosome makes a protein (it uses the mRNA as a recipe/template)mRNA as a recipe/template)

4.4. Rough ER packages the protein into a Rough ER packages the protein into a vesicle and sends it to the golgi vesicle and sends it to the golgi

5.5. The vesicle fuses to the golgi depositing The vesicle fuses to the golgi depositing the proteinthe protein

6.6. Golgi processes and packages the proteinGolgi processes and packages the protein7.7. Golgi vesicle pinches off the golgi Golgi vesicle pinches off the golgi

containing the modified proteincontaining the modified protein8.8. Vesicle fuses with the cell SURFACE Vesicle fuses with the cell SURFACE

membrane membrane 9.9. Cell surface membrane opens to release Cell surface membrane opens to release

the proteinthe protein

How many organelles are How many organelles are involved in the process?involved in the process?

NucleusNucleus RibosomeRibosome Rough ERRough ER GolgiGolgi

I get 4 key onesI get 4 key ones

Learning objectivesLearning objectives

Outline the interrelationship between Outline the interrelationship between the organelles involved in the the organelles involved in the production and secretion of proteins production and secretion of proteins (spec point g)(spec point g)

Recall the role of the cytoskeleton of Recall the role of the cytoskeleton of the cellthe cell

Explain the importance of the Explain the importance of the cytoskeleton of the cellcytoskeleton of the cell

How are things held in place in the How are things held in place in the cell?cell?

How do things know where to move in How do things know where to move in a cell? Is it random movement?a cell? Is it random movement?

Cytoskeleton – key spec Cytoskeleton – key spec pointspoints

Mechanical strengthMechanical strength TransportTransport Cell movementCell movement

Cell strengthCell strength

A series of protein fibres keep the cells A series of protein fibres keep the cells shape stable by providing a internal shape stable by providing a internal framework (cytoskeleton)framework (cytoskeleton)

Cell movementCell movement

Actin filaments can move against Actin filaments can move against eachother eachother

They are responsible for the movement seen They are responsible for the movement seen in white blood cellsin white blood cells

Microtubules (approx 25nm diameter Microtubules (approx 25nm diameter cylinders)cylinders)

Made from a protein tubulinMade from a protein tubulinThey can move a microorganism through a They can move a microorganism through a

liquid (flagellum) or move a liquid past a liquid (flagellum) or move a liquid past a cell (cilia)cell (cilia)

Transport of organelles and Transport of organelles and vesicles within a cellvesicles within a cell

Actin filaments can move some Actin filaments can move some organelles around inside the cellorganelles around inside the cell

Other proteins on the microtubules Other proteins on the microtubules inside the cell can move the inside the cell can move the organelles/vesicles along the fibresorganelles/vesicles along the fibres

These proteins are known as These proteins are known as microtubule motors (page 18 microtubule motors (page 18 extension)extension)

Examiners tipExaminers tip

All movement requires energy (ATP) All movement requires energy (ATP) cilia outside the cell and organelles cilia outside the cell and organelles within the cellwithin the cell

You can get a mark for mentioning You can get a mark for mentioning thatthat

Individual study taskIndividual study task

Research from your text eukaryotic Research from your text eukaryotic DNADNA

What is a prokaryotic cell?What is a prokaryotic cell? How can you distinguish between a How can you distinguish between a

prokaryotic and eukaryotic cell?prokaryotic and eukaryotic cell? How is eukaryotic DNA different from How is eukaryotic DNA different from

prokaryotic DNA?prokaryotic DNA?

PlenaryPlenary

Explain the importance of the Explain the importance of the cytoskeleton of the cellcytoskeleton of the cell

Paper to hand in Paper to hand in