A Level Biology OCR at University Of Wales, Aberystwyth | Flashcards & Summaries

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TESTE DEIN WISSEN
What is a glycosidic bond that forms between glucose molecules 
Lösung anzeigen
TESTE DEIN WISSEN
Its a covalent bond 
  • Two hydrogen atoms and oxygen atom are removed 
Its a condensation reaction 
  • water molecule formed as a product 
Forms between between carbon 1 and carbon 4 
Lösung ausblenden
TESTE DEIN WISSEN
How did Meselsohn and Stahl prove DNA replication id semi-conservative in 1958
Lösung anzeigen
TESTE DEIN WISSEN
They grew the bacteria Escherichia coil with different isotopes of nitrogen 
  • The 15N is heavy so makes a band low down the tube 
  • High density sinks further down the tube 
  • Transfer cells to 14N, allow growth for one generation
After one generation 
  • Only one band 
  • It was the 14/15 band
After second generation 
  • There were 2 bands 
  • A light chain and a 14/15 chain
Lösung ausblenden
TESTE DEIN WISSEN
What solution is used to test for reducing sugars 
Lösung anzeigen
TESTE DEIN WISSEN
Benedict’s reagent 
  • An alkaline solution of copper(II)sulphate 
Lösung ausblenden
TESTE DEIN WISSEN
Describe the structure of microfilaments?
Lösung anzeigen
TESTE DEIN WISSEN
They are contractile fibres formed from the protein actin
Lösung ausblenden
TESTE DEIN WISSEN
Describe the structure of cell wall 
Lösung anzeigen
TESTE DEIN WISSEN
Its made out of cellulose , a complex carbohydrate 
Lösung ausblenden
TESTE DEIN WISSEN
Name the roles of phosphate ions 
Lösung anzeigen
TESTE DEIN WISSEN
  • Cell membrane formation 
  • Nucleic acid and ATP formation 
  • Bone formation 
Lösung ausblenden
TESTE DEIN WISSEN
How are chromosomes formed 
Lösung anzeigen
TESTE DEIN WISSEN
DNA associates with histones ( proteins ) to form chromatin 
  • The chromaticoils and condenses 
Lösung ausblenden
TESTE DEIN WISSEN
How does a light microscope work ?
Lösung anzeigen
TESTE DEIN WISSEN
  • The objective lens produces a magnified image, which is magnified again by the eyepiece lens.
Lösung ausblenden
TESTE DEIN WISSEN
What us the role of a vesicle 
Lösung anzeigen
TESTE DEIN WISSEN
They are used to transport substances into or out of the cell
Lösung ausblenden
TESTE DEIN WISSEN
What is the magnification and resolution power of a transmission electron microscope ?
Lösung anzeigen
TESTE DEIN WISSEN
  •  X 500.000
  • 0.5nm
Lösung ausblenden
TESTE DEIN WISSEN
How does a scanning electron microscope work ?
Lösung anzeigen
TESTE DEIN WISSEN
  • A beam of electrons is sent across the surface of the specimen and reflected electrons are collected.
  • Porduces stunning 3d images of surfaces or specimens are produced 
Lösung ausblenden
TESTE DEIN WISSEN
What is the function of the nucleolus 
Lösung anzeigen
TESTE DEIN WISSEN
It is responsible of producing ribosomes 
Lösung ausblenden
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Q:
What is a glycosidic bond that forms between glucose molecules 
A:
Its a covalent bond 
  • Two hydrogen atoms and oxygen atom are removed 
Its a condensation reaction 
  • water molecule formed as a product 
Forms between between carbon 1 and carbon 4 
Q:
How did Meselsohn and Stahl prove DNA replication id semi-conservative in 1958
A:
They grew the bacteria Escherichia coil with different isotopes of nitrogen 
  • The 15N is heavy so makes a band low down the tube 
  • High density sinks further down the tube 
  • Transfer cells to 14N, allow growth for one generation
After one generation 
  • Only one band 
  • It was the 14/15 band
After second generation 
  • There were 2 bands 
  • A light chain and a 14/15 chain
Q:
What solution is used to test for reducing sugars 
A:
Benedict’s reagent 
  • An alkaline solution of copper(II)sulphate 
Q:
Describe the structure of microfilaments?
A:
They are contractile fibres formed from the protein actin
Q:
Describe the structure of cell wall 
A:
Its made out of cellulose , a complex carbohydrate 
Mehr Karteikarten anzeigen
Q:
Name the roles of phosphate ions 
A:
  • Cell membrane formation 
  • Nucleic acid and ATP formation 
  • Bone formation 
Q:
How are chromosomes formed 
A:
DNA associates with histones ( proteins ) to form chromatin 
  • The chromaticoils and condenses 
Q:
How does a light microscope work ?
A:
  • The objective lens produces a magnified image, which is magnified again by the eyepiece lens.
Q:
What us the role of a vesicle 
A:
They are used to transport substances into or out of the cell
Q:
What is the magnification and resolution power of a transmission electron microscope ?
A:
  •  X 500.000
  • 0.5nm
Q:
How does a scanning electron microscope work ?
A:
  • A beam of electrons is sent across the surface of the specimen and reflected electrons are collected.
  • Porduces stunning 3d images of surfaces or specimens are produced 
Q:
What is the function of the nucleolus 
A:
It is responsible of producing ribosomes 
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