Science You will need A pen and paper A digital device Learning intention To revise the key concepts and learning about cell structure and function Lesson 23 challenge answers Do you know the difference between a eukaryotic cell and a prokaryotic cell ID: 1042350
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1. Year 8Lesson 24 – cellsScience
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3. You will needA pen and paper. A digital device.
4. Learning intentionTo revise the key concepts and learning about cell structure and function.
5. Lesson 23: challenge answersDo you know the difference between a eukaryotic cell and a prokaryotic cell?Oh no! You mean to tell me that a prokaryotic cell does not have a distinct nucleus!nucleusYes! Yes! Eukaryotic cells do have a distinct nucleus! mitochondrion cell membraneEukaryotic cellSo a eukaryotic cell has mitochondria, a cell membrane, and reproduces by mitosis! Bees are made of eukaryotic cells. Dobee da da dobee da da – most prokaryotic cells are bacteria.
6. Reflect on your understanding of cellsThe next set of slides have questions on cells. Check your answers by clicking on the green bar.
7. What is the smallest measurement a light microscope can see? Click on the green bar to check the answer.Micrometres Question 1
8. Click on the green bar to check the answer.Name the parts of the microscope:a) On which the slide is placed. ____________________________________________b) Used to focus on low power. _____________________________________________c) Used to reflect light through the specimen. _____________________________________________d) The lens closest to the eye when the microscope is in use. _____________________________________________stagefine focus knobmirrorobjective Question 2
9. Cell wallVacuoleCytoplasmChloroplastClick on the green bar to check the answer.Name the structures of this plant cell:Left side, from top to bottom: cytoplasm, vacuoleRight side, from top to bottom: cell wall, chloroplastQuestion 3
10. Scale drawingsThe diagram below shows a paramecium and a human egg and sperm cell.The diagrams are drawn to scale. If the human egg is 130 micrometres in diameter determine the length of the Paramecium and sperm cell using the diagrams. Sperm EggParameciumSource: PixabayClick on the green bar to check the answer.Paramecium is about 320 micrometres and the sperm is about 40 μm.Question 4
11. Calculate the length of the cell.2.5 cm 25 μm250 μm ABCClick on the green bar to check the answer.BQuestion 5
12. Match the following organelles with their meaning.chromosomeRod-shaped organelles with a double membrane. The inner membrane is infolded many times. Converts the sugars into energy for the cell.cytoplasmA specialised subunit within a cell that has a specific function, and is usually separately enclosed within its own membrane.chloroplastThreadlike, DNA-containing bodies found in the nucleus of all plants and animals, responsible for transmitting hereditary characteristics.organelleControls many of the functions of the cell (and contains DNA (in chromosomes). mitochondrionThe jellylike material outside the cell nucleus in which the organelles are located.cell wallMembrane-bound cavity filled with fluid.nucleusAn disc-shaped organelle containing chlorophyll. Photosynthesis (in which energy from sunlight is converted into food) occurs in this organelle.vacuoleA thick, rigid membrane that surrounds a plant cell. This layer of cellulose fibre gives the cell most of its support and structure.Question 6
13. Check your answersmitochondrionRod-shaped organelles with a double membrane. The inner membrane is infolded many times. Converts the sugars into energy for the cell.organelleA specialised subunit within a cell that has a specific function, and is usually separately enclosed within its own membrane.chromosomeThreadlike, DNA-containing bodies found in the nucleus of all plants and animals, responsible for transmitting hereditary characteristics.nucleusControls many of the functions of the cell (and contains DNA (in chromosomes). cytoplasmThe jellylike material outside the cell nucleus in which the organelles are located.vacuoleMembrane-bound cavity filled with fluid.chloroplastAn disc-shaped organelle containing chlorophyll. Photosynthesis (in which energy from sunlight is converted into food) occurs in this organelle.cell wallA thick, rigid membrane that surrounds a plant cell. This layer of cellulose fibre gives the cell most of its support and structure.Click on the green box to reveal the answers.
14. ChallengeDo the protozoa dance.Move like an amoeba by making false feet.Move like a paramecium with cilia beating.Move like a euglena with a whiplike flagellum.For each protozoa, what song would you choose that would match the timing of the movements? Hint: You might need to use the internet to find out more about how these protozoa move, to help you.
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