Bio 10

Question 1

What are the three fundamental points of cell theory?

Answer 1

• All organisms are made from cells
• The cell is the smallest unit of life
• All cells come from pre-existing cells

Question 2

What did the scientist Hooke do?

Answer 2

Observed thin slices of cork, which appeared as small boxes or rooms, which he named cells.

Question 3

What did Leeuwenhoek do?

Answer 3

-created lenses & simple microscopes
- Studied blood cells, pond water, & teeth plaque
-first to describe animalcules
-first to observe nucleus

Question 4

What did schleiden do?

Answer 4

-studied plants and concluded all plants are composed of cells
- Observed Nuclei

Question 5

What did schwann do?

Answer 5

• Described finding like schleiden but in animal cells
  -Concuded animal tissues were composed of cells
• Stated that all organisms are made of cells

Question 6

What did virchow do?

Answer 6

• Concluded that where a cell exists, there must have been a pre-existing cell

Question 7

What were the variables of redi’s experiment with spontaneous generation?

Answer 7

MV: Presence of jar lid
RV: Precence of maggots
CV: same type of jar, same type of meat, temperature,location, etc.

Question 8

What were the variables of pastur’s experiment with abiogenesis

Answer 8

MV: Type of flask (swan neck)
RV: Presense of microbes
CV: same type of everything

Question 9

How do light microscopes work?

Answer 9

Magnify objects using one or more curved lenses and a light source. Most compound light microscopes will magnify specimen 1000x. This is the most common type of microscope in a school lab

Question 10

How do electron microscopes work?

Answer 10

• Specimens are illuminated with a beam of electrons generating a photograph of the specimen called an electron micrograph

Question 11

What are the three factors of how they affect the image

Answer 11

• Magnification
• Contrast
• Resolution