2.6 Structure of DNA and RNA

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2.6 Structure of DNA and RNA

2.6 Structure of DNA and RNA

Concept mapping of the 2.6 Structure of DNA and RNA

Knowledge control of 2.6 Structure of DNA and RNA 

Essential idea:


2.6.1 The structure of DNA allows efficient storage of genetic information.



What is DNA?

DNA learning center

Symphony of Science -- DNA and Life

DNA Learning Center

Evidence that DNA is the genetic material


Nature of science:


2.6.2 Using models as representation of the real world—Crick and Watson used model making to discover the structure of DNA. (1.10)


The Secret of Life - Discovery of DNA Structure




2.6.3 The nucleic acids DNA and RNA are polymers of nucleotides.


Chargaff's ratio


2.6.4 DNA differs from RNA in the number of strands present, the base composition and the type of pentose.




2.6.5 DNA is a double helix made of two antiparallel strands of nucleotides linked by hydrogen bonding between complementary base pairs.


DNA Supercoiling Video




2.6.6 Application: Crick and Watson’s elucidation of the structure of DNA using

model making.


 Build a DNA Molecule




2.6.7  Skill: Drawing simple diagrams of the structure of single nucleotides of DNA and RNA, using circles, pentagons and rectangles to represent phosphates,

pentoses and bases.





2.6.8  In diagrams of DNA structure, the helical shape does not need to be shown, but the two strands should be shown antiparallel. Adenine should be shown paired with thymine and guanine with cytosine, but the relative lengths of the purine and pyrimidine bases do not need to be recalled, nor the numbers

of hydrogen bonds between the base pairs.


1 DNA game

2 DNA game


Theory of knowledge:


2.6.9  The story of the elucidation of the structure of DNA illustrates that

cooperation and collaboration among scientists exists alongside competition

between research groups. To what extent is research in secret ‘anti-scientific’?

What is the relationship between shared and personal knowledge in the

natural sciences?




2.6.10 Syllabus and cross-curricular links:



Topic 2.2 Water

Topic 3.5 Genetic modification and biotechnology

Topic 7 Nucleic acids

2.6 Structure of DNA and RNA Past Paper Questions

2.6 Structure of DNA and RNA Presentation

2.6 Structure of DNA and RNA Animations/Videos


Practical 2

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