M2 2.1 Microscopy

Question 1

First type of microscope to be developed?

Answer 1

Light microscopes (in 16th to 17th century)

Question 2

What does cell theory state?

Answer 2

1) both plant and animal tissue is composed of cells
2) cells are the basic unit of all life
3) cells only develop from existing cells

Question 3

What are the advantages of light microscopes

Answer 3

1) easily available
2) relatively cheap
3) can be used out in the field
4) can observe living and dead organisms

Question 4

What’s the timeline for the development of Cell Theory

Answer 4

1665- cell first observed by Robert Hooke using a light microscope
1674-1683- Anton van Leeuwenhoek was the first to observe bacteria and protoctista. He went on to also observe red blood cells, sperm and muscle fibres.
1832- evidence for the origin - Dumortier first to observe cell division in plants
1833- both of a universal cell theory
1844- Remak first to observe cell division in animal cells
1860- Pasteur disproved theory of spontaneous generation of cells by showing bacteria would only grow in a sterile nutrient broth after it had been exposed to air.

Question 5

How does a light microscope works

Answer 5

Compound light microscope has 2 lenses (eyepiece lens and objective lens). Both lenses work together to magnify to high resolutions.

Question 6

What’s the formula for magnification

Answer 6

Magnification=size of image/actual size of object