Struggling with genetics questions? You need to know the four key DNA bases: adenine, guanine, thymine and cytosine. These fall into two groups: • Purines • Pyrimidines Adenine and guanine are purines, while thymine and cytosine are pyrimidines. The easiest trick to remember it: if it has the letter Y, it’s a pyrimidine. This question appeared on the 2025 paper and is likely to come up again. #LeavingCertBiology #BiologyRevision #Genetics #DNA #StudyTipsIreland | The Dublin Academy of Education
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