Before Watson and Crick Built Their DNA Model, the American

question 5

Multiple Choice

Before Watson and Crick built their DNA model, the American chemist and Nobel laureate Linus Pauling proposed a triple-helix model for DNA.What evidence convinced Watson and Crick to reject this model for the double-helix model?

• A) Franklin's X-ray crystallography
• B) Chargaff's observations of base pairing
• C) Avery's studies of DNA as the transforming agent
• D) The Hershey and Chase blender experiment
• E) Studies examining the stability of DNA

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Definitions:

Template Matching

A technique in pattern recognition in which a predefined template or pattern is compared with potential matches.

Prototype Matching

A cognitive process where new items are compared to an idealized or average category member to make recognition or classification decisions.

Gibson's Theory

A theory of perception that emphasizes the importance of environmental affordances and direct perception, proposed by psychologist James Gibson.

Directly Perceive

The process by which sensory information is immediately registered and understood without the need for conscious thought or interpretation.