TrueTrue Hands on Hands on HeadsHeadsFalseFalse Hands on HipsHands on Hips Sit down when you get a question Sit down when you get a question wrongwrong

•1.1. A micrometre is 1/1000A micrometre is 1/1000thth of a of a metre.metre.

Yes it is! Things that are measured Yes it is! Things that are measured in micrometres are very small in micrometres are very small indeed!indeed!

•2.2. Nanometres are larger Nanometres are larger than micrometres.than micrometres.

Nanometres are 1/10000Nanometres are 1/10000thth of a of a metre!metre!

•3.3. Red blood cells are smaller Red blood cells are smaller than white blood cells. than white blood cells.

They are. They are very simple and They are. They are very simple and are flattened in shapeare flattened in shape

•4.4. On the microscope On the microscope pictured, the eyepiece would pictured, the eyepiece would go into A.go into A.

A

•5.5. You would place a You would place a microscope slide on the microscope slide on the objective.objective.

There are 3 objective lenses There are 3 objective lenses on the revolving nosepiece. on the revolving nosepiece. Usually they are just called Usually they are just called ‘objectives’.‘objectives’.

•6.6. On the microscope, the On the microscope, the diaphragm is used to focus diaphragm is used to focus a specimen.a specimen.

No! The diaphragm controls the No! The diaphragm controls the amount of light passing through amount of light passing through the specimen.the specimen.

•7.7. Light passes through 3 Light passes through 3 lenses when focussing on a lenses when focussing on a specimen.specimen.

Light passes through 2 lenses: the Light passes through 2 lenses: the one in the eyepiece and an one in the eyepiece and an objective lens.objective lens.

•8.8. A cover slip is placed on A cover slip is placed on top of the specimen.top of the specimen.

Absolutely! The specimen and a Absolutely! The specimen and a drop of water is placed on the drop of water is placed on the microscope slide, then the cover microscope slide, then the cover slip is dropped on top.slip is dropped on top.

•9.9. A pipette is used to apply A pipette is used to apply a drop of water to a specimen a drop of water to a specimen on a microscope slide.on a microscope slide.

•10.10. When a specimen is observed When a specimen is observed through a microscope its image through a microscope its image appears upside down and back to appears upside down and back to front. front.

Absolutely! This is because of the Absolutely! This is because of the way light travels through the 2 way light travels through the 2 lenses.lenses.

•11.11. The 3 objectives have The 3 objectives have magnifications of x4, x10 and magnifications of x4, x10 and x100.x100.

They are x4, x10 and x40.They are x4, x10 and x40.

•12.12. The eyepiece has a The eyepiece has a magnification of x10. If a magnification of x10. If a x4 objective is used the x4 objective is used the total magnification will be total magnification will be x400.x400.

The total magnification equals the The total magnification equals the magnification of the eyepiece X the magnification of the eyepiece X the magnification of the objective. In magnification of the objective. In this case it will be 4 X 10 = 40. this case it will be 4 X 10 = 40.

•13.13. Methyl blue stain is used Methyl blue stain is used to see a cellto see a cell’’s nucleus more s nucleus more clearly.clearly.

The nucleus stains dark blue with The nucleus stains dark blue with methyl blue.methyl blue.

•14.14. You can see the cell wall You can see the cell wall of an onion cell using a light of an onion cell using a light microscope.microscope.

With a stain, you can see the With a stain, you can see the nucleus and the geometric cell wall nucleus and the geometric cell wall very clearly.very clearly.

•15.15. A hypothesis is a prediction A hypothesis is a prediction of the outcome of an of the outcome of an experiment. experiment.

Absolutely! It is how you apply Absolutely! It is how you apply your understanding of the theory your understanding of the theory to how you think the experiment to how you think the experiment will go.will go.

•16.16. The cell wall lies inside The cell wall lies inside the cell membrane.the cell membrane.

No the cell wall is a thick structure No the cell wall is a thick structure that lies outside the cell membrane that lies outside the cell membrane and supports the cell.and supports the cell.

•17.17. Cytoplasm is mostly Cytoplasm is mostly water. water.

Yep and some dissolved salts.Yep and some dissolved salts.

•18.18. Chloroplasts can be Chloroplasts can be found in plant and animal found in plant and animal cells.cells.

No way, enzymes cause chemical No way, enzymes cause chemical digestion.digestion.

•19.19. Chloroplasts convert Chloroplasts convert sunlight to sugar.sunlight to sugar.

Plants use this sugar to grow.Plants use this sugar to grow.

•20.20. Chloroplasts Chloroplasts move around the cell.move around the cell.

In a process called cytoplasmic In a process called cytoplasmic streaming.streaming.

•21.21. The activities of all cells The activities of all cells are controlled by their are controlled by their nucleus.nucleus.

Just like the brain controls our Just like the brain controls our bodies.bodies.

•22.22. Mitochondria release Mitochondria release energy for cellsenergy for cells’’ activities. activities.

Absolutely! They are the cell’s Absolutely! They are the cell’s powerhouse.powerhouse.

•23.23. Ribosomes are the Ribosomes are the workbenches upon which workbenches upon which proteins are made.proteins are made.

Absolutely! They are found loose in Absolutely! They are found loose in the cytoplasm and on endoplasmic the cytoplasm and on endoplasmic reticulum.reticulum.

•24.24. Endoplasmic reticulum Endoplasmic reticulum are responsible for are responsible for recycling waste materials.recycling waste materials.

Endoplasmic reticulum is the cell’s Endoplasmic reticulum is the cell’s transport system.transport system.

•25.25. Vacuoles are usually Vacuoles are usually small in plant cells.small in plant cells.

Plant cells usually contain a large Plant cells usually contain a large vacuole, animal cells a small one.vacuole, animal cells a small one.

•26.26. Lysosomes are the cellLysosomes are the cell’’s s recycling units.recycling units.

Absolutely! They take worn out cell Absolutely! They take worn out cell components and break them downcomponents and break them down

•27.27. Golgi make water Golgi make water available to the cell. available to the cell.

They are involved in repackaging They are involved in repackaging proteins for transport out of the proteins for transport out of the cell.cell.

•28.28. Plant and animal Plant and animal cells contain ribosomes.cells contain ribosomes.

Absolutely! They both make Absolutely! They both make proteins.proteins.

•29.29. Plant and animal Plant and animal cells both have cell cells both have cell membranes.membranes.

Absolutely! Plant cells have an Absolutely! Plant cells have an extra layer called the cell wall.extra layer called the cell wall.

•30.30. The cell wall controls The cell wall controls the passage of materials in the passage of materials in and out of the cell.and out of the cell.

The cell membrane does. The cell The cell membrane does. The cell wall lends the cell strength and wall lends the cell strength and support.support.