Chapter 185 of 2363 min read

Gene regulation: lac operon; Human Genome Project, DNA fingerprinting

Why this is asked: The lac operon is off by default — the repressor sits on the operator and blocks transcription — and lactose itself (as allolactose) is the inducer that removes the repressor, switching on one polycistronic mRNA for all three structural genes at once, unlike any eukaryotic gene.

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Test yourself

•Which chromosome in the human genome has the highest number of genes?
•The lactose present in the growth medium of bacteria is transported into the cell by the action of:

Open this in the full syllabus view · Botany

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