There were four rules of parity given by Erwin Chargaff 

1) Base A in one strand of the duplex is matched by (T) in the other strand, and base G in one strand of the duplex is matched by a complementary base (C) in the other strand

2) equal amounts of A and T, and equal amounts of C and G, in each single strand of the duplex. 

3) Purines in non-template strand applies more closely to Exons

4) GC content tends to be greater in exons than in introns

choose the correct option regarding rules 

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#Question id: 109

#Unit 1. Molecules and their Interaction Relevant to Biology

A deficiency in the synthesis of sphingomyelins or cerebrosides will most likely result in the improper formation of

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#Question id: 15883

#Unit 12. Applied Biology

Sucrose is replace by another sugar in tobacco callus medium without effecting callus growth. This sugar is an osmotic agent and is not taken into the plant cells or metabolized because of its molecular size.

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#Question id: 5320

#Unit 11. Evolution and Behavior

Which of the following types of genes or gene families may be created by mutations that occur in one member of a gene pair that arose from gene duplication:?

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#Question id: 2606

#Unit 2. Cellular Organization

Activity of trp operon is taken as a measurement of ;

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#Question id: 12603

#Unit 10. Ecological Principles

As big as it is, the ocean is nutrient-limited. If you wanted to investigate this, one reasonable avenue would be to