Unit One Flashcards Preview

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Flashcards in Unit One Deck (24)
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1
Q

what was used to be a light source for the light microscope back in the day

A

flame or direct sunlight

2
Q

robert hooke discovered what under the light microscope

A

cork cells

3
Q

when did robert hook discover cork cells

A

1665

4
Q

what term did robert hooke coin

A

cell theory

5
Q

what is the cell theory

A

life comes from life

6
Q

what are the four things that can be seen under the microscope

A
  1. cell sizes
  2. movement, shape changes, cell division
  3. cell staining
  4. cellular anatomy
7
Q

what level of magnification can the naked eye see

A

2 mm

8
Q

to see cells what is the magnification range

A

.2 mm to 2 micrometers

9
Q

to see organelles what is the magnification range

A

a little over 2 micrometers to a little under 200 nm

10
Q

what magnification is needed for minimum resolvable by light microscope

A

200 nm

11
Q

to see molecules, what is the magnification range

A

over 20 nm to .2 nm

12
Q

what magnification is needed for the minimum resolvable by electron microscope

A

.2 nm

13
Q

to see atoms what is the magnification range

A

.2 nm and less

14
Q

light microscopy has magnification up to

A

1000x

15
Q

light microscopy has a resolution of

A

.2 mm

16
Q

how does light microscopy work

A

light source is put through a condenser that focuses it through a specimen and objective to be seen through eye piece

17
Q

what is resolution

A

ability of microscope to distinguish two separate objects based on how close

18
Q

what is fluorescent microscopy

A

uses fluorescent staining to see specimen and filters isolate correct wavelength

19
Q

what is confocal microscopy

A

uses laser as light source, this provides more detail

20
Q

what image does a confocal microscope create

A

2-D image, but computer can interpret to 3-D

21
Q

What is transmission electron microscopy

A

transmits beam of electrons

22
Q

what is the magnification and resolution of a transmission electron microscope

A

magnification of 1 million and resolution of 2 nm

23
Q

what is scanning electron microscopy

A

coats the specimen with a heavy metal (gold coin) that produces a 3-D image

24
Q

what is the magnification of a scanning electron microscope

A

1 million