2. The base composition and base ratios of nucleic acids from eight different vi

Question

2. The base composition and base ratios of nucleic acids from eight different viruses are given below. For fill in as much of the following as possible, indicate if the nucleic acid is DNA or RNA, and/or if or double stranded. Note again: It may not be possible to fill in all spaces. Percentages A+TorU AtG d.s or DNA or G+C C+TorU S.s.? RNA? Virus G CA T U Explanation 1 19 19 31 31 2 19 19 31 3 31 31 19 19 31 1.00 1.26 5 25 18 25 32 20 25 23 6 1.00 1.00 1.00 ou need for the above problems is Chargaf's Laws. Use these laws and your brain-synthesize information and thirn iny little bit "out of the box". And,.., no math is needed just a little of basic arithmetic!

Explanation / Answer

Percentage

G C A T U

A+T or U

G+C

A+G

C+T/U

ds: the percentage of complementary bases are equal. G:C=19:19, A:T=31:31

DNA: It has T instead of U

ds: The percentage of complementary base are same. G:C=19:19 and A:U = 31:31

RNA: Has U aas a base pair which is a RNA base

same as 1

ss: G:C= 25:18, the complementary bases are not equal. That means it has no ds.

DNA: Same as 1

ss: G:C= 20:25, It should be 1:1 ratio for a ds Genome.

RNA : same as 2

V

Percentage

G C A T U

A+T or U

G+C

A+G

C+T/U

d.s or s.s DNA/ RNA Explaination 1 19 19 31 31 ds DNA

ds: the percentage of complementary bases are equal. G:C=19:19, A:T=31:31

DNA: It has T instead of U

2 19 19 31 31   ds RNA

ds: The percentage of complementary base are same. G:C=19:19 and A:U = 31:31

RNA: Has U aas a base pair which is a RNA base

3 31 31 19 19 ds DNA

same as 1

4 1.0 1.26 ss A+G / C+T = 1.26, This is the ratio between complementary bases. This ration should be one for a ds genome 5 25 18 25 32 ss DNA

ss: G:C= 25:18, the complementary bases are not equal. That means it has no ds.

DNA: Same as 1

6 20 25 23 32 ss RNA

ss: G:C= 20:25, It should be 1:1 ratio for a ds Genome.

RNA : same as 2

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