BiologyWise
Biology Wise: Purines and Pyrimidines
Purines and pyrimidines are nucleotides. Their properties are described here and their differences are highlighted. Includes examples of each.
BiologyWise
Biology Wise: What Is a Stop Codon?
A stop codon is a nucleotide triplet in messenger RNA that signals the end of a protein during the translation process. Read about how this works, the different types of stop codons, and how a mutation can sometimes occur.
BiologyWise
Biology Wise: Start Codon
A start codon is a nucleotide triplet in a genetic sequence that occurs at the start of a protein's synthesis. Read about how this works and how a mutation can sometimes occur.
McGraw Hill
The Mc Graw Hill Companies, Inc.: Rna
This brief site provides a comparison of DNA and RNA along with a brief explanation of the role of RNA within the cell.