I've been using the 4th edition for the last 2.5 weeks. I just finished Molecular Genetics (chapter 7 in 3rd edition and chapter 9 in the 4th edition). During my second reading of the chapter using Ferrali's notes, I noticed some major differences in both the chapter topics and details so I compared the 2 editions (I have the 4th in print and the 3rd as pdf).
One major difference between the 2 editions is the inclusion of Cell Communication (G-Protein, ligand-ion, and RTK pathways) as chapter 6 in the 4th edition, which isn't present in the 3rd edition.
To those who have taken the DAT, is this chapter crucial?
Another major difference between the 3rd and 4th edition was in the Molecular Genetics chapter. The 4th edition goes into waaaaaaaay more detail* than the 3rd. End all be all, it took me much longer than I had anticipated to finish this chapter.
*(e.g. experiments that lead to the discovery of the DNA molecule, pages of extra detail on gene regulation of prokaryotes vs eukaryotes, explanations of postranslational modifications, a subsection on just DNA cloning, etc)
Having read this thread, I feel like a dunce for not looking into which edition would be better when I began because I assumed newer is better.
I've heard that the DAT biology section is very random and broad, but does it focus enough on fine details to justify the use of the 4th edition? Should I switch to the 3rd edition?