2.1 Cell Structure

Question 1

Resolution definition

Answer 1

The ability to distinguish between two separate points on an image

Question 2

Magnification definition

Answer 2

The number of times larger an image appears compared to its actual size

Question 3

Give and advantage and disadvantage of using light microscopes

Answer 3

ADVANTAGE - relatively cheap and easy to use. Can use live specimens
DISADVANTAGE - low resolution and magnification

Question 4

Describe how transmission electron microscopes work

Answer 4

Transmit beam of electrons through specimen. Specimen must be thin and dead. Produces 2D, black and white image. high resolution

Question 5

Describe how scanning electron microscope works

Answer 5

Electrons fired at surface of specimen and bounce off. Can be used on thicker specimens. Gives lower resolution than TEM. 3D image, black and white.

Question 6

Give a disadvantage of electron microscopes

Answer 6

Require lots of specialist training to use.
Expensive