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mamaluj [8]
3 years ago
13

When testing a person's skin for allergens using patch testing, tiny amounts of allergens are placed on stainless steel discs an

d applied to the back. How many hours later is the skin under the discs assessed for reaction?
Biology
2 answers:
Airida [17]3 years ago
7 0

Answer:

48 hours

Explanation:

Patch testing is a method to test the allergic reactions called contact dermatitis caused by the allergens found in the environment the patient is surrounded by like home allergens or work allergens.

To perform the test, the allergens are placed on the metal discs which are pasted on the back of the person with hypoallergenic tape.

Then the discs are allowed to be pasted on the back of the person for about 2 days or 48 hours after which the skin is examined for the allergy reactions caused by an allergen in the form of inflammatory response or hypersensitivity.

Thus, 48 hours is the correct answer.

Jet001 [13]3 years ago
7 0

Answer:

The correct answer is - 48 hours.

Explanation:

Skin patch testing is the process or the testing method that is used to detect allergic dermatitis an individual person could be affected of from the atmosphere around him. In this test the patch with substances to test, in a small discs to skin of a person.

The test substances to the skin under the disc that are then left in place for 48 hours. The skin is then assessed a further 48 hours later for any allergic reaction.

Thus, the correct answer is - 48 hours.

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Answer:

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Explanation:

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1. Termination. Out of the 64 codons, UAG, UAA, and UGA are the stop codons that terminate translation when encountered by the ribosome. These three do not code for any amino acid but rather cause the translation complex to dislocate.


2. Translation. In this process, the ribosome ‘reads’ the codon and brings in a t-RNA with an anticodon to the codon. This tRNA carries a specific amino acid (for that codon) and engages in the P-site of the ribosome. The amino acid is taken from the t-RNA and used to elongate the polypeptide chain being formed. Thereafter the empty t-RNA dislocates.


3. Aminoacyl-tRNA synthetase. When a tRNA brings in an amino acid to the initiation complex, it is dislocated when ‘empty’. Aminoacyl-tRNA synthetase then catalyzes the reattachment of another amino acid through a chemical reaction called esterification. The cognate tRNA then become an aminoacyl-tRNA.


4. tRNA . Every tRNA has an amino acid attached to it. The type of amino acid (out of the 22 amino acids) is determined by the anticodon on the tRNA. There are many codons that are amino acids meaning that there are redundant codons that specify for the same amino acid.


5. Initiation. Initiation begins by the formation of an initiation complex. This complex is comprosed by the two subunits of the ribosome, and the mRNA. The complex becomes compelete when a Met-tRNA (a tRNA with a methionine amino acid) engages the P-site and then translation begins.


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