The correct answer is option C, that is, a chemical indicator, and the beaker is green because a little CO2 is present.
The bromothymol blue refers to a pH indicator. It is mainly used in the processes that need the determination of substances, which would exhibit a relatively neutral pH. A common application of bromothymol blue is determining the existence of carbonic acid in a liquid.
The bromothymol blue is an indicator, which turns from blue to green to yellow as the solution becomes more acidic due to the formation of carbonic acid.
In the given case, the beaker becomes green in the presence of bromothymol blue because maybe there is some presence of carbon dioxide in the beaker, and as more formation of carbonic acid takes place, the solution in the beaker would turn more into yellow.
Here is a list showing how the bacteria grows:
Begin - 15
1st hour - 30
2nd hour - 60
3rd hour - 120
4th hour - 240
5th hour - 480
6th hour - 960
7th hour - 1,920
8th hour - 3,840
9th hour - 7,680
10th hour - 15,360
11th hour - 30,720
12th hour - 61,440
As you can see, the number of bacteria present is doubled at the end of each hour, as the question states. However, the question is not asking for the total number of bacteria at the end of the 12th hour; it is asking for the bacteria GROWN during the 12th hour.
Because there were 30,720 bacteria at the end of the 11th hour, and 61,440 at the end of the 12th, the number of bacteria that grew during that last hour must be 61,440 - 30,720 = 30,720 bacteria.
(P.S. the answer would be 61,440 if it was asking for the TOTAL number of bacteria at the end of the 12th hour)
I believe it is E and C. Hope this helps!! Brainleist Please!!!
Answer:
The correct answer would be d. wild-type.
Wild type refers to the gene, strain, or character which is most commonly found in the population in natural conditions.
The allele or the gene which is found rarely in the population is termed as mutant allele or character.
For example, the wild-type phenotype of fur color of tigers is orange with black strips whereas the mutant phenotype would be a white coat with black strips.
