Answer:
5.2 × 10 ⁹ cfu
Explanation:
Applying the dilution factors
0.1 ml of the final dilution contains 52 colonies
1 ml would thus have around 520 colonies
10 ml of the final sample would contain 5200 colonies
at a 1 / 100 dilution
1 ml of the sample holds 5200 colonies
100 ml of the sample will yield 520000 colonies
1 ml from the 0.1 ml + 9.9 ml encompasses 520000 colonies
10 ml would then have 5200000
following the second stage of the dilution
0.1 ml of the slurry contained 5200000 colonies
1 ml would yield 52000000 colonies
10 ml would lead to 520000000 colonies
100 ml of the starting sample ( 10 grams + 90 ml ) results in 5200000000 colonies =
5.2 × 10 ⁹ cfu
Answer:
In my opinion, answer number 4 is the right one.
Explanation:
Single-celled amoebas perform all essential life functions like capturing food, digesting it, respiration, excretion, and reproduction, similar to multicellular animals.
