B1

Question 1

What do light microscopes use to form an image?

Answer 1

A beam of light

Question 2

How much can the best light micrscopes magnify?

Answer 2

X2000

Question 3

How much do school microscopes usually magnify?

Answer 3

Several hundred times.

Question 4

Advantages of using light micrscopes?

Answer 4

• Relatively cheap
• Can be used almost anywhere
• Can magnify live specimens

Question 5

When were the first light microscopes developed?

Answer 5

Mid-17th century

Question 6

When was the electron microscope invented?

Answer 6

1930s

Question 7

Of what significance was the inventiom of the electron microscope?

Answer 7

Allowed biologists to see and understand more about the subcellular structures inside cells.

Question 8

What do electrom microscopes use to form an image?

Answer 8

A beam of electrons

Question 9

How much can electron microscopes magnify?

Answer 9

2,000,000 times

Question 10

What do transmission electron microscopes give?

Answer 10

2D images with very high magnification and resolution

Question 11

What do scanning electron microscopes give?

Answer 11

Dramatic 3D images but lower magnifications.

Question 12

Disadvantages of electron microscopes

Answer 12

• Large
• Very expensive
• Have to be kept in special temeperature and pressure
• Have to be kept in humidity-controlled rooms