Key Concepts in Biology
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- Created by: sara.5
- Created on: 16-04-18 16:39
What is the magnification for Hooke's microscope?
x30
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What is the magnification for Van Leeuwenhoek microscope?
x270
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What is the Resolution for Van Leeuwenhoek microscope?
0.0014mm
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What is meant by resolution?
The smallest point between two point that can still be seen as two points
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What is the magnification for a light microscope?
x1500
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What is the resolution for a light microscope?
0.0001
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What is the difference between a light and electron microscope?
Instead of light beams of electron passes a specimen to build up an image
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What is the magnification for an electron microscope?
x2000000
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What is the resolution for an electron microscope?
0.0000002mm
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What is the formula for image?
Image= Magnification x Actual size
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What is meant by a Eukaryotic cell?
A cell with a Nucleus
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What is the function of the Nucleus in a cell?
Controls cell activity and contains genetic material
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What is the function of the Cytoplasm in a cell?
Where chemical reaction happens
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What is the function of the Ribosomes in a cell?
Responsible for protein synthesis
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What is the function of the Mitochondria in a cell?
Site of Aerobic respiration (power house)
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What is the function of the Cell Wall in a cell?
Contains cellulose which keeps cell rigid
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What is the function of the Chloroplasts in a cell?
Contains chlorophyll, traps sunlight for photosynthesis
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What is the function of the Vacuole in a cell?
Contains cell sap(salt and sugar) contains waste product to prevent contamination
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What is the function of the Cell membrane in a cell?
Controls what goes in and out of the cell
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What do cells that line the small intestine do?
Absorb food
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What are it adaptation?
Having membranes which contain tiny fold called cilia ?
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Why is this helpful?
This increases surface area of cells therefor there is more area for more molecules to be absorbed therefore absorption happens faster
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What does a pancreas do?
Make enzymes to digest certain foods?
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How are they adapted?
Enzymes are proteins so these cells are adapted by having lots of ribosomes
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What does the wall of the small intestine do?
The muscles squeezes food along
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How is this adapted?
Muscles squeeze food along therefore they need a lot of energy they are adapted by having many mitochondria
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How is the cell membrane of the egg cell adapted?
-Cell membrane fuses with Sperm cell membrane after fertilisation then membrane hardens to stop other cells entering
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How is the Jell coat of the egg cell adapted?
Hardens after fertilisation to ensure only one sperm enters
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How is the Cytoplasm of the egg cell adapted ?
Cytoplasm is packed with nutrients to supply fertilised egg with energy/material for growth and development of the embryo
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How is the top of the Sperm adapted?
Contains a small vacuole which has enzymes called Acrosome the enzyme breaks substances in the egg cell jelly coat allowing sperm to burrow in
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How doe the tail of the sperm help with its function?
Tail moves from side to side allowing sperm to swim
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Why does the sperm contain a spiral of Mitochondria?
To release a lot of energy to power the tail
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What happens in the oviducts?
Fertilisation
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Where do the cell lining the oviduct transport the egg cell?
Towards the uterus
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How are the oviducts adapted?
Cilia is also covered in cell membrane and contain strands of substance that can contract and cause a wavy movement sweeping substances along
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Other cards in this set
Card 2
Front
What is the magnification for Van Leeuwenhoek microscope?
Back
x270
Card 3
Front
What is the Resolution for Van Leeuwenhoek microscope?
Back
Card 4
Front
What is meant by resolution?
Back
Card 5
Front
What is the magnification for a light microscope?
Back
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