Restriction endonucleases differ from DNA ligase because the former cuts DNA at specific sequences while the latter joins DNA strands by forming phosphodiester bonds.
Complementary DNA differs from genomic DNA because cDNA lacks introns and is derived from mRNA, making it ideal for expression in prokaryotic hosts.
Vectors vary in their strengths; plasmids are stable in bacteria, viruses efficiently deliver genes into eukaryotic nuclei, and liposomes fuse easily with cell membranes.
Gene cloning differs from gene expression because cloning produces many identical DNA copies, whereas expression produces functional proteins from those genes.
Always specify the enzymes used in recombinant DNA processes, ensuring that restriction endonucleases and DNA ligase are named correctly.
Identify whether sticky ends or blunt ends are produced, because sticky ends significantly increase the likelihood of successful gene insertion.
Check whether the gene source is eukaryotic; if so, cDNA is often required to avoid introns that prokaryotic hosts cannot process.
When describing transformation, include the role of marker genes and selection techniques to demonstrate complete conceptual understanding.
A common misconception is that different organisms interpret codons differently, but the genetic code is nearly universal, enabling cross-species gene expression.
Students often confuse PCR with transcription, but PCR amplifies DNA in vitro while transcription produces RNA inside cells.
Learners may incorrectly assume that all transformed cells incorporate the vector, but many attempts fail, requiring marker genes for identification.
Some incorrectly believe restriction enzymes cut randomly, when in fact they recognize specific base sequences known as restriction sites.
