Personal Genome Project Study Guide
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Part I: Genetic Material

Part II: Gene Transmission

Part III: Gene Expression

Part IV: Genetic Regulation

Part V: Genetics and Society

Part VI: Project Literacy

 

 

 

 

 		  Part I: Genetic Material
Lesson 2: The Structure of DNA
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Lesson 2 Practice Test

The DNA duplex molecule, also called the double helix, consists of two strands that wind around each other.  The strands are held together by chemical attraction of the bases that DNA is made of. A bonds to T and G bonds to C. The bases are linked together to form long strands by a "backbone" chemical structure.  The DNA bases and backbone twist around to make a duplex spiral.

The backbone structure is shown in orange and yellow.

 

 



The bases are shown as sticks and the backbone structure is shown as ribbons.