A-LevelBiologyNucleic acids and protein synthesisOct/Nov 2025Paper 2 Q313 Marks
The gene LCT codes for the enzyme lactase. In babies, lactase synthesis is necessary for digesting lactose, the sugar found in milk. Another gene, MCM6, has introns that have a regulatory role in the expression of gene LCT. Gene MCM6 codes for a protein that has no involvement in lactase synthesis. As children get older, the MCM6 introns are responsible for a decrease in lactase synthesis. This decrease in lactase synthesis is known as lactase non-persistence.
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