[Free Registration/Login may be required to access all resource tools.] Covers gene regulation in eukaryotes.

Evolution is the change of inherited characteristics within a population over time through natural selection, which may result in the formation of a new species.

Learn more about the operon model based on studies of lactose-dependent mutations of E. coli with the series of problems presented here. The correct answers have a brief explanation to reinforce the theories and incorrect answers are...

It is fairly well-accepted that American slavery of the 19th century developed from three distinct traditions of slavery that were mutated into a new, racialized, institutionalized form: European indentured servitude, West African...

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.

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.

Macroevolution and microevolution are defined, along with mutation, migration, genetic drift, and natural selection, which are "established mechanisms of evolutionary change."

Discover more about the late-breaking research into DNA repair shops located in the cell. The work is being done by NASA scientists who are interested in the effects of radiation on astronauts. (Nov. 7, 2007)