Skills in A Level Biology (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
Why are optical microscopes essential tools for biologists?
Why are optical microscopes essential tools for biologists?
They magnify structures too small to see
How do optical microscopes create a magnified image?
How do optical microscopes create a magnified image?
Light passes through lenses
What are the three standard objective lens magnifications?
What are the three standard objective lens magnifications?
×4, ×10, ×40
What is the function of the turret on an optical microscope?
What is the function of the turret on an optical microscope?
Rotates objective lenses into position
When should you use the coarse focus mechanism?
When should you use the coarse focus mechanism?
Initial focusing at low & medium power
Why must specimens be thin or transparent?
Why must specimens be thin or transparent?
To allow light to pass through
What is the purpose of using isotonic solutions?
What is the purpose of using isotonic solutions?
Prevent osmotic damage to cells
Which stain is used to observe chromosomes during cell division?
Which stain is used to observe chromosomes during cell division?
Acetic-orcein stain
What is a graticule?
What is a graticule?
Transparent disc with scale in eyepiece
Why must a graticule be calibrated with a stage micrometer?
Why must a graticule be calibrated with a stage micrometer?
Graticule has no fixed units