scientific method/microscopes

Question 1

what is the scientific method?

Answer 1

series of steps used by scientists to solve a problem/answer to a question.

Question 2

whats the steps of the scientific method? (5 steps)

Answer 2

step one: observe/ask a questions
step two: form a hypothesis 
step theee: design a controlled expiriment 
step four: record and analyze results 
step five: drawing conclusions

Question 3

whats a hypothesis?

Answer 3

possible explanation to a question/problem

Question 4

whats a controlled experiment?

Answer 4

only one variable changes at a time

Question 5

what is an independent variable?

Answer 5

is being deliberately changed by the scientist

Question 6

whats the dependent variable?

Answer 6

observed during an experiment

Question 7

whats a theroy?

Answer 7

a broad statment of what is thought to be true

Question 8

who is Hans and Zacharias Janssen?

Answer 8

built a compound microscope of 20x

Question 9

whats compound mean?

Answer 9

more than one lens

Question 10

whos Robert Hooke?

Answer 10

first to use the term cell, observed many cells and focused on understanding cork and 1665

Question 11

whos Antoni van Leeuwenhoek?

Answer 11

used single lens light microscope (250x mag.) and first to see/record bacteria

Question 12

whats magnification?

Answer 12

number of times larger the specimen appears under a lens

Question 13

whats resolution

Answer 13

• ability to distinguish detail of seprate objects that are close contrast

Question 14

what did Robert Hooke use?

Answer 14

used the word cell to describe repetitive pockets he observed in cork

Question 15

what did Antoni do during the time Hooke was using the word cell?

Answer 15

also observed cells but they were living (bacteria, protozoa, sperm) (called animalcules)

Question 16

what’d Robert Brown do?

Answer 16

identified nucleus while studying orchids

Question 17

who are Schleiden and Shawann in 1839?

Answer 17

proposed the cell is the basic unit of life

Question 18

whos Rudolf Virchow?

Answer 18

beleived all cells arise only from pre-exsisting cells

Question 19

whats the modern cell theory? (3 things)

Answer 19

1. all cells are made up of 1+ cells
2. all life functions take place in the cells (smallest unit of life)
3. all cells are produced from pre-existing cells

Question 20

who disproved spontaneous generation?

Answer 20

louis pasteur

Question 21

what is spontaneous generation?

Answer 21

life appears out of non living matter

Question 22

whats contrast

Answer 22

• difference between light and dark edges (adding stain improves this)

Question 23

advantages and disadvantages to staining/fixing

Answer 23

advantages- improves contrast, able to see more, more clear

disadvantages- kills cells

Question 24

whats flourescent stains

Answer 24

flourescent molocules bind to specific structures and are revealed under UV light