A professor has been isolating and purifying DNA and RNA from a variety of organisms. The label on one of the tubes has fallen off. What sort of a test can she run to determine if the tube contains DNA?
a. A test for the presence of adenine.
b. A test for the presence of guanine.
c. A test for the presence of cytosine.
d. A test for the presence of thymine.
e. A test for the presence of uracil.
2006-11-11 19:07:42 · 10 answers · asked by Reese 1 in Science & Mathematics ➔ Biology
Both RNA and DNA contain adenine, guanine and cytosine
Only DNA has thymine and only RNA has uracil
Therefore it would be d that tells the professor if theres a presence of DNA
2006-11-11 19:21:00 · answer #1 · answered by anonymous 2 · 0⤊ 0⤋
It is neither a,b, or c as RNA and DNA both contain adenine,guanine, and cytosine. The presence of thymine will indicate if a sample is DNA. But if you only have two samples where one is RNA and another is DNA, then testing for uracil will let you know which one is which. If the test tube shows uracil, that means it is RNA as only RNA has uracil.
2006-11-12 08:29:47 · answer #2 · answered by joe19 4 · 0⤊ 0⤋
to find out if the tube contains DNA, the prof should run a test for thymine as RNA does not have thymine, but uracil instead.
so the test tube which gives a positive result will be the one that has DNA.
2006-11-12 04:16:41 · answer #3 · answered by Kish 3 · 0⤊ 0⤋
The answer is either d or e
- The presence of uracil would indicate that it is RNA,. If it is negative for Uracil, then it is DNA. The presence of thymine indicates DNA and its absence RNA. DNA forms AT and GC base pairs. RNA forms UA and CG base pairs.
2006-11-12 04:24:30 · answer #4 · answered by Labsci 7 · 0⤊ 0⤋
That's a silly test.
If they run a test for D or E, they will know if it contains DNA.
If there is Thymine present, they will know it is DNA. If Uracil is present, they will know that it isn't.
Then again, if there's only one answer, e is most logical, considering it's the only non-DNA pyrimidine.
2006-11-12 03:21:10 · answer #5 · answered by Jocelyn 3 · 0⤊ 0⤋
its very easy
since it is dna and rna
just place a sample in system and analyse it technology improved a lot
do the test for uracil
2006-11-12 03:51:23 · answer #6 · answered by jaya 2 · 0⤊ 0⤋
D...thymine would be more accurate becuase uracil many times is missed by tests so D...
2006-11-12 04:03:53 · answer #7 · answered by futuremodel21 2 · 0⤊ 0⤋
E Uracil (if I remember correctly will not be found in DNA)
2006-11-12 03:15:10 · answer #8 · answered by konstipashen 5 · 1⤊ 0⤋
I don't remember "Urasil" in DNA, just AGCT and a double Helix
2006-11-12 06:09:38 · answer #9 · answered by Anonymous · 0⤊ 0⤋
e
2006-11-12 03:10:02 · answer #10 · answered by Sarah G 2 · 1⤊ 0⤋