Microbial Growth

Question 1

Plate count

Answer 1

count of viable live cells, considered low end

Question 2

CFU

Answer 2

colony forming units, used instead of counting cells because more than one cell could have landed there and started the colony.

Question 3

serial dilution

Answer 3

diluting the bacteria in order to get 30-300 count, statistically significant.

Question 4

membrane filtration technique

Answer 4

filtering drinking water through a membrane to catch microorganisms then grow them on a petri plate. Opposite of diluting

Question 5

Turbidity

Answer 5

cloudiness of sample, indirect cell count, calibration curve

Question 6

Indirect methods of counting cells

Answer 6

measuring turbidity, measuring dry weight

Question 7

biofilms

Answer 7

ecosystems of bacteria that can form on anything.

Question 8

steps of biofilm attachment

Answer 8

1. Reversible attachment
2. First colonizers become irreversibly attached
3. Growth and division
4. Production of EPS and water channels
5. Dispersion of some for new colony