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Methionine gives a negative result in the lead acetate test because it does not contain sulfhydryl (-SH) groups or any functional groups that can form lead sulfide (PbS), the black precipitate indicative of a positive test. The lead acetate test is specifically designed to detect the presence of compounds with sulfur, such as cysteine or cystine, which react with lead acetate to produce a visible precipitate. Since methionine lacks these reactive sulfur groups, it does not yield a positive result in this test.
What else can I help you with?
Why does the number of negative factors affect the signs of the product in math equations?
Multiplying or dividing a positive and negative gives a negative result. Multiplying or dividing two negatives gives a positive result.
What number equals 8 squared?
64
What number multiplied by 6 gives you a negative 18 as a result?
6 X -3 = -18 so negative three.
Why the conjugation only change the sign of the imaginary part?
when you square a negative number you also get a positive result (because a negative times a negative gives a positive)
What is the answer to -22 x 22?
A negative number multiplied by a positive number gives a negative result, so -22 times 22 is -484
What is 16 minus negative 12?
28. Subtracting a negative number gives the same result as adding a positive.
Can a negative number be a square?
the square is positive always.Except in the case of an Imaginary number. An imaginary number is a number that gives a negative result when squared,where i= √-1
What gives a banana its nice taste what chemicals are involved?
Isoamyl acetate and n-butyl acetate are two of the more common esters which give a banana flavor
Multiply 3 x -5?
8
Do two positives make a negative in division?
No, a positive number divided by another positive number gives a positive result.
How do you reduce a fraction with a negative number as the numerator and denominator?
A negative number divided by another negative number (much like a negative number multiplied by another negative number) gives you a positive result. The two minus signs cancel each other out.
What is negative 8 over 4 simplified?
Negative 8 over 4 simplifies to -2. This is because when dividing a negative number by a positive number, the result is negative. In this case, dividing -8 by 4 gives us -2.
