Higher Enzyme Steps and Ethical Debate on GM Crops

Higher Enzyme Steps and Ethical Debate on GM Crops

Detailed enzyme mechanism:

• Restriction enzymes recognise palindromic sequences — sequences that read the same on both strands in opposite directions (e.g., GAATTC/CTTAAG).
• They make staggered cuts, leaving single-stranded overhangs ("sticky ends") of typically 4 bases.
• These sticky ends have complementary sequences that allow the gene and the vector to anneal (join by hydrogen bonding) before ligase permanently seals the covalent backbone bonds.
• Not all bacteria take up the recombinant plasmid — scientists use antibiotic resistance marker genes in the plasmid to identify which bacteria have been successfully transformed.

Ethical debate — GM crops:

• Arguments for: Could reduce global hunger by increasing yields; golden rice could prevent vitamin A deficiency affecting 250 million children; reduces pesticide use and its environmental damage; precision and speed compared to selective breeding.
• Arguments against: Gene transfer to wild relatives could create resistant weeds; unknown long-term ecological consequences; large corporations control seeds, reducing farmer autonomy; ethical concerns about "playing God" with natural organisms; some religious and cultural objections.
• The scientific consensus: Currently approved GM crops are safe for human consumption — but this does not resolve the separate environmental and ethical debates.