Chapter 2 - Basic Components Of Living Systems

Question 1

When was the cell first observed?

Answer 1

1665 by Robert Hooke

Question 2

When were the first living cells observed?

Answer 2

1674-1683 by Anton van Leeuwenhoek. He examined samples of pond water. He discovered bacteria, protoctista and went on to observe red blood cells, sperm cells and muscle fibres.

Question 3

What happened in 1832?

Answer 3

Evidence for the origin of new plant cells

Barthélemy Dumortier, a Belgian botanist. Helped to discover how cells reproduced.

Question 4

What did Robert Brown do?

Answer 4

In 1833, he described the nucleus of a plant cell

Question 5

When was universal cell theory born?

Answer 5

1837-38

Theodor Schwann declared that “all living things are composed of cells and cell products”

Question 6

1860

Answer 6

Spontaneous generation disproved

Question 7

Magnification definition

Answer 7

How many times the image is bigger than the actual size of the object

Question 8

What is the definition of resolution?

Answer 8

The ability to see individual objects as separate entities

Question 9

Why are light microscopes less clear than electro-microscopes?

Answer 9

Resolution is limited by the diffraction of light as it passes through material

Question 10

What is the equation for magnification?

Answer 10

Size of image
Magnification = ________________________

                        Actual size of specimen