6) (1 pt) On the planet Rama, the DNA is of six nucleotide types: A, B, C, D, E

Question

6) (1 pt) On the planet Rama, the DNA is of six nucleotide types: A, B, C, D, E and F. A and E are called marzines, C and D are orsines and E and F are pirines. The following rules are valid for all Raman DNAs: total marzines-total orsines total purines Propose a general model for the structure of Raman DNA. 7) (3 pts) Indicate whether each of the following descriptions about the structure of double- stranded DNA is true or false. If false, explain why. a) A+T-G+C b) A-G and CT c) A/T-C/G d) T/A-C/G e) A+G-C+T f C/A-T/G

Explanation / Answer

6)The proposed model for general structure of Raman DNA is a triple helix. Where three strands of DNA coil over each other such that each marzine interacts with a orsine which bonds to a purine or a different permutation of the same. In this way the condition Total marzines = Total orsines = Total purines will he fulfilled. Also each A would mutually bind with C and E. Each C woth A and E. And each E with A and C. Similarly B, D and F will also mutually bind. This will take care of the second rule A=C=E and B=D=F

7) a False. A + G = C + T as number of purines = Number of pyrimidines. As each purine covalently bonds with a pyrimidine. Hence the statement is false

b False. A=T and G=C, since these two form a nucleotide base pair. Not A, G and C, T

c True. A=T, hence A/T=1

And C=G, therefore C/G=1

Using both equations. A/T=C/G= 1

d also T/A = 1 ( From the same equation T=A)

Hence T/A= C/G = 1

e) True. Purines (A+G) = Pyrimidines (C+T)

As each purine covalently base pairs with a purimidine

f) False. A/T=G/C is the correct statement.

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