Evolution caused different anatomy..
the brain is differently wired in men and womens
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Hope this helped
Because bile contains salts and digestive compounds and lipase is a digestive enzyme, you might create a simple qualitative experiment to test the action of bile and lipase. Bile is first used to emulsify and break down food entering the small intestine, and lipase is used afterwards by the pancreas to break down fats. With this information, I suggest this experiment:
1) Label 4 test tubes A, B, C, and D. Divide the fat solution equally into the 4 tubes.
2) In tube B, add an x amount (but not the whole volume) of the bile solution.
3) in tube C, add a y amount (but not the whole volume) of lipase solution.
4) in tube D, add the x amount of bile and the y amount of lipase solution.
5) Swirl/mix until everything looks homogenized/settled.
6) tube A is your control. Compare the 3 other tubes to it and write observations. You should be able to make conclusions about the role of bile in digesting a fatty solution, and the extent of digestion with and without the additional lipase.
Hope this is helpful!~ There are certainly many other possible experiments.
Complete question
- It has to be E. coli because it is positive for gapA
- It can't be Salmonella, because it is negative for the invA marker but still makes people sick
- It has to be used because it is positive for the apeE marker
Answer:
<u>1. It can't be Salmonella, because it is negative for the invA marker but still makes people sick </u>
- A combination of positive results from the multiplex PCR inva, apee and gapa is used to definitively identify Salmonella.
- Pathogenic, or disease causing Salmonella is definitely not present, as inva is required for it to be pathogenic. The test did not detect the inva sequence, thus it is truly negative for this particular pathogen.
<u>2. It has to be E. coli because it is positive for gapA </u>
- E. coli may be present, as gapa was detected- a presumptive positive. However, this may need to be definitively determined through further methods of sample analysis, such as 2D-gel electrophoresis.
- apee may belong to another type of bacteria present within the initial sample, or there may be sample contamination
Explanation:
Polymerase chain reactions, PCRs are a form of nucleic acid amplification testing NAAT that exploit the mechanism of transcription by using a thermostable DNA polymerase. These require a sample of genetic material such as RNA or DNA; specific regions of the gene sequence are targeted for replication by primers. In the presence of these specific gene sequences, the primers make billions of copies of the sequences.
However, if these gene sequences are absent, the primers are not capable of identifying and amplifying the sequence. This reaction is highly specific. Positives obtained have a high chance of being true positives and negatives have a high chance of being true negatives
.
Pathogens or infectious agents that are capable of causing disease i.e. making people sick. Both E. coli and Salmonella are genuses of enteric bacteria capable of causing disease via fecal contamination. Common symptoms include
- abdominal cramps
- vomiting
- fever
- diarrhea
This test would include primers for the detection of each sequence: gapa, apee, inva. Salmonella's inva was not detected, thus it is not present.
Further steps may include a 2 D gel electrophoresis- here an electrical current is utilized to separate bands of DNA within the sample. This should correspond with an expected DNA size in base pairs or bp for E.coli- this should be determined by running the sample in the gel with a positive control, containing genetic material for E coli, and a negative control, of purified water to determine contamination.