The structures of the four bases in DNA are given in Figure 5-42. 
Figure 5-42
A.Which are purines and which are pyrimidines?
B.Which bases pair with each other in double-stranded DNA?
Definitions:
Profane Language
The use of words or expressions considered disrespectful, vulgar, or abusive in certain contexts or cultures.
Approving Laughter
Laughter that expresses agreement, appreciation, or support, often occurring in social interactions to convey positive reinforcement.
Operant Conditioning
An educational method where the intensity of an action is altered through rewards or penalties.
Shaping Procedure
A method of positive reinforcement of behavior by which successive approximations of a desired behavior are reinforced.
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