# A scientist found that a Petri dish from an experiment had not been cleaned several days earlier. In the dish, she discovered a bacterial culture that she had not seen during the experiment. How could she gather evidence to support a claim about whether the bacteria had developed from the material left from the earlier experiment? a)Take a sample of the bacteria and grow it in an incubator. b)Gather dirty Petri dishes from other labs to see if they grow the same bacteria. c)Check all the clean Petri dishes for residue from the previous experiment. D)Try the original experiment again, do not clean some of the Petri dishes, and see if the bacteria grow.

D

Explanation:

The best way she can gather evidence to support a claim of the bacteria developing from the material left from the earlier experiment would be to repeat the original experiment again, leave some of the Petri-dishes uncleaned, and then see if the same bacteria would grow on the uncleaned Petri dishes.

If indeed the bacteria developed from the material left from the earlier experiment, the same bacteria should grow on the uncleaned Petri dishes in the second experiment. If they do not grow, it means that the source of the bacteria is from somewhere else within the lab.

The correct option is D.

Explanation:

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## Related Questions

A population is made up of individuals where 149 have the A1A1 genotype, 18 have the A1A2 genotype, and 154 have the A2A2 genotype. What is the allele frequency of A1? Answer to 2 decimal places.

In population individuals where 149 have the A1A1 genotype, 18 have the A1A2 genotype, and 154 have the A2A2 genotype, so the allele frequency of A1 is 0.49.

### What is the allele frequency?

The incidence of a gene variant within a population is represented by the allele frequency. Alleles are different versions of a gene that share the same genetic locus on a chromosome.

To determine the allele frequency of A1

There is the formula:

frequency of A1 = (2 x number of A1A1) + Number of A1A2/ 2 x population

so, A1A1 = 149

A1A2 = 18

Population = 149 + 18 + 154 = 321

The frequency of A1 = (2 x 149) + 18/ 2 x 321

hence the frequency of A1 = 0.49

Therefore, the allele frequency of A1 is 0.49.

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A or b

Explanation:

When I finally arrived at the meeting place, a crowd of folks was gathered around the fountain.Which word should replace folks in order to maintain a formal tone?
Select one:

fellas

people

guys

dudes

People would be the best

Fossils give evidence of continental drift False
True

False it has nothing to do with continental drift

Explain how capillary action is really just teamwork between adhesion and cohesion.

The red blood cells are cohesive, meaning they want to stick together. if one cell moves along the capillary this cohesion will drag the neighboring cell with it. the cells are also adhesive to the capillary walls, so they stick along the tube lining as they are dragged through the capillary.

Which will occur if humans continue to overload water systems with excess water?

eutrophication

Explanation:

Excessive amounts of nutrients speed up the eutrophication process. Which will occur if humans continue to overload water systems

... A recreational lake experiences eutrophication because of excess nutrients.

Will give brainlistEarth's surface is constantly changing, and new landforms are constantly taking shape due to natural processes. Which landform is most likely caused by deposition?
A. caves
B. valleys
C. Deltas
D. lakes