Question

Four nucleic acid samples are analyzed to determine the percentages of the nucleotides they contain. Based...

Four nucleic acid samples are analyzed to determine the percentages of the nucleotides they contain. Based on the data in the table below, determine which samples are DNA and which samples are RNA, and specify whether each sample is double-stranded or single stranded. Explain your reasoning.

A

G

T

U

C

Sample 1

28%

28%

0%

22%

22%

Sample 2

31%

19%

0%

31%

19%

Sample 3

16%

16%

34%

0%

34%

Sample 4

26%

24%

26%

0%

24%
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Answer #1

I believe the correct options to be:

Sample 1: Single stranded RNA due to the presence of Uracil in place of Thymine. Since A binds with U, for it to be double stranded, the percentage of A and U must be same so this is a single stranded molecule.

Sample 2: Double stranded RNA due to the presence of Uracil in place of Thymine. Double stranded for the same reason mentioned above.

Sample 3: Single stranded DNA due to the presence of Thymine. Single stranded for the same reason that A and T are not same which they should be in case of double stranded.

Sample 4: Double stranded DNA due to the presence of Thymine. Double stranded for the same reason mentioned above.

Feel free to leave a comment down below for any furhter query. Good rating would be appretiated if you find my answer helpful. Thank you.

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