Genetics Practice Problem Set I 1. A single stranded DNA molecule has the follow

Question

Genetics Practice Problem Set I 1. A single stranded DNA molecule has the following ratios Name A/T-13, Gvc 43; and (ATXG+C)87 What is its (A+GXT + C) ratio? A complementary DNA strand is formed. Give the following ratios for this complementary strand: G/C (A+GNT + C)- (A +CT+ G) NC- NG . 2. The base composition and base ratios of nucleic acids from eight different viruses are given below. fill in as much ofthe/al n lng as possible, indicate if the nucleic acid is DNA or RNA,and or or double stranded. Note again: It may mot be possible to fill in all spaces For each of the viruses if these molecules are single AtTorU A+G r DNA or Gtc.ctTor U sa? RNAZ Percentages Virus GCA T U 1 19 19 31 31 19-19-31 31311919 31 5 25 18 25 32 Laws. Use these laws and your brain-synthesize information and think l you need for the above problems is Chargaffs a tiny little bit "out of the box". And , no math is neededust a little of basic arithmetic!

Explanation / Answer

1.(A+G)/(T+C) = 2/3

A/T = 3/1

G/C = 3/4

A+T/G+C = 4/7

(A+G)/(T+C) = 6/5

A+C/T+G = 7/4

A/C=3/4

A/G=3/3=1

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