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Why did Watson and Crick suggest that purines connect with pyrimidines between DNA strands?

Why did Watson and Crick suggest that adenine binds with thymine and guanine binds with cytosine between two DNA strands?

How many amino acids exist in living organisms?

Draw an amino acid. What are the adenine binds with thymine and guanine binds with cytosine between two DNA strands?

Which of the four components of an amino acid differ from one to the next?

How do R-groups vary by polarity?

Which type of R-groups bend toward water? Away from water?

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