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The ninhydrin test is positive for all proteins because it reacts with free amino groups found in the amino acids that make up proteins. When ninhydrin is applied, it forms a colored complex, typically purple or blue, indicating the presence of amino acids. Since all proteins consist of amino acids linked by peptide bonds, the test detects these amino groups, leading to a positive result for any protein. This makes the ninhydrin test a general method for assessing the presence of proteins in a sample.
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All living cells would test positive for amino acids?
Yes, all living cells contain amino acids, which are the building blocks of proteins. Proteins are essential for various biological processes, such as enzyme catalysis, structural support, and cell signaling. Therefore, a test for amino acids would likely be positive in all living cells.
Why ninhydrin shows positive test for amino acid and protein?
Ninhydrin reacts with ammonia, a primary amine, or a secondary amine (amino acids have a primary or alpha amino group, except for proline which has a secondary amino group). They all turn purple/blue right away upon heating with ninhydrin.Remember that a protein has a amino terminal and a -COOH terminal. The ninhydrin will react with the amino terminal giving a very light blue or violet color (more often than not you will see no color change). Upon further heating you may notice an increase in the intensity of the blue/violet. this is due to the heat denaturing the protein, thereby exposing more -NH2 groups for the ninhydrin reagent to react with
What should you do if a cranial nerve test is positive?
It all depends on what nerve and what it is positive for.
What is the positive result for molisch test?
all carbohydrates show positive result to Molisch test. this is because Molisch test is used to distinguish carbohydrates from other organic compound.
What prescribed amphetamines can cause a drug test to be positive?
All of them
What if all your pregnancy test say positive?
Then you are probably pregnant.
Is it possible to get 3 false positives in a roll... I'm about 7 days late I took 3 hpt and all 3 were positive... so it possible that all 3 tests were false positives.. help?
hi, all positive test are accurate, only negative test are not reliable.but if you had 3 test and all came up positive then yes you are defenately pregnant. best of luck...
Could I be pregnant took 2 preg test having all the symptoms went to clinic their test was positive?
Then you are pregnant
If you have a miscarriage will a pregnancy test still show positive?
Until all the hormones are washed from your body, you can still show positive on an OTC pregnancy test. The earlier you miscarry the sooner the test will become negative as there are fewer hormones in the body.
What mixture of sugars gives positive results for all five tests?
A mixture of glucose, fructose, sucrose, and lactose typically yields positive results for all five common sugar tests: Benedict's test (for reducing sugars), Barfoed's test (for monosaccharides), Molisch's test (for all carbohydrates), Seliwanoff's test (to differentiate between aldoses and ketoses), and the iodine test (for starch). This combination includes both reducing and non-reducing sugars, ensuring a positive outcome across the different tests.
If a man and a child took a paternity test and it came back positive is it a chance that the child is not his?
It all depends on if the test was done correctly
What will make you test positive for oxycodone?
I have taken 30mg of oxycodone once two or three days before my drug screen. Will the test be positive, as my boyfriend has a prescription. I have prescriptions for xanax and ritalin, but not for the oxycodone.
