Chapter 2

Question 1

are used to express the sizes of microbes

Answer 1

Metric Units

Question 2

• one that contains only one magnifying lens
• leeuwenhoek’s simple microscope had a maximum magnifying power of about 300x

Answer 2

Simple Microscopes

Question 3

• contains more than one magnifying lens
• because visible light is the source of illumination, a compound microscope is also referred as compound light microscope
• compound light microscopes usually magnify objects about 1,000 times

Answer 3

Compound microscope

Question 4

Types of compound microscope

Answer 4

Phase contrast and fluorescence

Question 5

used to observe living organisms - organisms are more easily seen because the light
refracted by living cells is different from the light refracted by the surrounding medium.

Answer 5

Phase Contrast

Question 6

contain a built in ultraviolet (UV) light source - when the UV light strikes certain dyes and
pigments, these substances emit a longer wavelength light, causing them to glow against a dark background

Answer 6

Fluorescence

Question 7

enable us to see extremely small microbes such as rabies and smallpox viruses.

Answer 7

Electron Microscope

Question 8

2 types of electron microscopes

Answer 8

Transmission and Scanning

Question 9

This microscope uses an electron gun to fire a beam of electrons through an extremely thin specime

Answer 9

Transmission electron microscope