Practical 4 study module 2

Question 1

make sure you know how to label the microscope

Answer 1

make sure you know how to label the microscope

Question 2

how does staining help contrast

Answer 2

it helps to contrast by staining the cell walls of bacterial cells

Question 3

what are three basic common stains

Answer 3

the gram stain
endospore stain
acid-fast stain

Question 4

why are differential stains important

Answer 4

these are important because it allows you to see different parts of the same cell that you wouldn’t normally see

Question 5

who discovered the gram stain

Answer 5

hans chris gram

Question 6

what color do gram positive bacteria stain

Answer 6

gram positive bacteria stains purple

Question 7

what color does gram negative bacteria stain

Answer 7

pink

Question 8

what is a mordant

Answer 8

a mordant helps the dye stick to the outside of the cell walls

Question 9

what three reasons would cause an organism from a pure culture to stain both gram positive and gram negative

Answer 9

the organism itself
inconsistant inoculation
too much or too little decolorizer